Get Zoho Mail API working (including DRE Connector, Oauth Token, ZUID, ZOID & ACCOUNT_ID)

Get Zoho Mail API working (including DRE Connector, Oauth Token, ZUID, ZOID & ACCOUNT_ID)

Disclaimer: I’m not a professional coder!



Do you need to use Zoho Mail API?


Me too. It lets you do all sorts of things — like reading the complete header of an email, or forwarding an email with its attachments — which is what I wanted to do.


But setting up the API (application programming interface) took me hours.


It didn’t need to, but advice on this forum sent me in circles and, while the Knowledgebase probably has all the information, it’s not easy to determine which are the relevant bits. So…


Maybe this little guide will help you.

       To use Zoho Mail API you need:

a) A working OAuth Token (Open Authorization token)

b) Up to three Zoho IDs — User, Organization, Account

c) Depending on what you want to do, additional IDs for emails, folders, etc


OAUTH TOKEN


The token validates you when you make an API call. There are various ways to create it.

The hard way: it’s possible to create an OAuth token via Developer Space but this requires lots of options to be chosen and the OAuth token needs to be frequently refreshed. This route is intended for developers who are using external apps to link with Zoho.


The easy way, at least for me, was via a custom function in filters — because it’s simple to do, refreshing the OAuth token is handled by Zoho, and creating a custom function is what I was trying to do anyway


If you already have an OAuth token, great. If not, but have already created a custom function, jump to 4 below. Alternatively:


      1)    In Zoho Mail, go to settings/filters

      2)    Create a new filter and, under Actions, select ‘Custom Function’. Zoho help file here.

      3)    Click ‘Select Function’ and create a new function or use an existing one

      4)    Once the custom function is on screen, select ‘DRE Connectors’ (Deluge Runtime Environment) at the top right

      5)    Click ‘Create Connection’ and under ‘Default Services’ choose ‘Zoho OAuth’

      6)    ‘Connection Name’ can be anything you like. It’s the ‘Connection Link Name’ that you will use in your Deluge scripts.

      7)    Chose the ‘Scopes’ of your token. There are zillions of them and they determine what your script can and can’t do. The most basic might be ‘ZohoMail.messages.READ’. The API Guide Index lists every API command and, for each, details what scope you need (e.g. the send an email page shows you’ll need the scope  ZohoMail.messages.ALL or ZohoMail.messages.CREATE). It's good security practice to only use the minimum scope you need.

      8)    After you click ‘Create and Connect’ you should have a working OAuth token with a lowercase ‘link name’ that you can paste into your Deluge scripts.


NB: The OAuth token only applies to the Zoho area where you have your account (Zoho.eu in my case). So, for example, if I cut and paste a snippet into my script from the send an email page: https://mail.zoho.com/api/accounts/{accountId}/messages it will NOT work with my Europe OAuth token. I would need to change the snippet to: https://mail.zoho.eu/api/accounts/{accountId}/messages


GETTING YOUR IDS


Without API

You’ll see from the snippet above that this particular API needs your ‘accountId’ to work. Zoho advises getting your IDs via an API call, but you don't need to:


1)   Zoho User ID (ZUID).  Just log into Zoho and click the ‘My Profile’ icon (top right). Your user ID is right there under your name and email address.

2)  Zoho Organisation ID (ZOID). Open your Zoho Mail Dashboard (remember, this link is for zoho.eu, you’ll need to use your area). Then select ‘Organization’ on the left menu bar to display ‘Organization Info’, including your Zoho Organization ID.

3) Zoho Account ID (ZAID). Select any of your emails in Zoho Mail. Right click and pick 'Open in New Window'. Your Zoho Accound ID is the number following "accId=". (See Zoho's help page to get the message ID of emails — it also shows the accountId.)

With API
Alternatively, you can get all three IDs with one API call: https://mail.zoho.eu/api/accounts (remember to adjust for your area). Help page here for what scope you need for this API call. The call returns a mass of information but buried in it are your Zoho User ID (ZUID), Zoho Organisation ID (ZOID) and Zoho Account ID (ZAID).


So how do I make the API call?

There are various ways but I use a bit of deluge script:

apiUrl = "https://mail.zoho.eu/api/accounts";
response = invokeurl
[
    url :apiUrl
    type :GET
    connection:"your_oauth_token" // the OAuth token you created, in quotes
];
info response;

1) Create a new Zoho Mail custom function and paste in the above script.
2 ) In the function window, click 'Test Run' (top right). You'll be asked for a Message ID.
3) For this script, any message will do. Select any message in your Zoho Mail inbox. Right click and choose 'Open in New Window'. You'll see the Message ID after 'msgId=' in the URL displayed by your browser. See here for visual.
4) Paste the Message ID into the function window and press 'Proceed'. You'll be presented with the heading 'Console' and the result of your API call beneath it, where you'll find the IDs you need after 'zuid=', 'zoid=' and 'accountId='.

FOLDER & EMAIL IDs


      1)    You may be able to use the name of a folder (e.g. “Trash”) in your Deluge script but if you need the folder ID number, either use this API or, even easier, select an email in the folder your interested in, right click and pick 'Open in New Window'. The folder ID comes after 'folId=' in the browser URL.

      2)    All my scripts are triggered by an email by arriving in my inbox. The ID for that current email is held in the variable ‘mail_messageId’.

      3)    For everything else refer to the API Guide Index


Finally, there might be a better way to do any of the above — I did warn you I’m not a pro! — please feel free to add improvements.


      Zoho Campaigns Resources


        • Desk Community Learning Series


        • Digest


        • Functions


        • Meetups


        • Kbase


        • Resources


        • Glossary


        • Desk Marketplace


        • MVP Corner


        • Word of the Day


        • Ask the Experts


          • Sticky Posts

          • Pocket from Mozilla is closing shop. Don’t lose your favorites . Move them to Zoho Mail Bookmarks now! 📥🔖

            The end of Pocket shouldn't mean the end of your important links and content. Easily import them into Zoho Mail's Bookmarks and continue right where you left off. You can bring over your entire Saves, Collections, and tags just the way they are. Bookmarks
          • Zoho Mail POP & IMAP Server Details

            Hello all! We have been receiving a number of requests regarding the errors while configuring or using Zoho Mail account in POP/ IMAP clients. The server details vary based on your account type and the Datacenter in which your account is setup. Ensure
          • Workplace - Zoholics Europe Customer Awards

            Dear Zoho Mail Community! 📣 We're excited to announce that at this year's Zoholics events across Europe, we're holding customer awards for the first time ever! Workplace - Zoholics Europe Customer Awards This is your chance to shout about the amazing
          • Important update on Group Management | Zoho Mail

            Dear Zoho Mail Community, This post is to inform you all of the following updates on the Group Management in Zoho Mail. Group Member Addition: If a group member is added to an organization group in a Zoho Application, the member will be automatically
          • Mastering email etiquette and best practices to follow in Zoho Mail

            Hello Zoho Mail Community, We’re thrilled to invite you all to our upcoming webinar: Mastering email etiquette and best practices to follow in Zoho Mail. Join our live webinar for expert etiquette tips to enhance your professionalism and elevate your

          Zoho CRM Plus Resources

            Zoho Books Resources


              Zoho Subscriptions Resources

                Zoho Projects Resources


                  Zoho Sprints Resources


                    Zoho Orchestly Resources


                      Zoho Creator Resources


                        Zoho WorkDrive Resources



                          Zoho CRM Resources

                          • CRM Community Learning Series

                            CRM Community Learning Series


                          • Tips

                            Tips

                          • Functions

                            Functions

                          • Meetups

                            Meetups

                          • Kbase

                            Kbase

                          • Resources

                            Resources

                          • Digest

                            Digest

                          • CRM Marketplace

                            CRM Marketplace

                          • MVP Corner

                            MVP Corner




                            Zoho Writer Writer

                            Get Started. Write Away!

                            Writer is a powerful online word processor, designed for collaborative work.

                              Zoho CRM コンテンツ




                                ご検討中の方

                                  • Recent Topics

                                  • Client Script | Update - Client Script Support For Custom Buttons

                                    Hello everyone! We are excited to announce one of the most requested features - Client Script support for Custom Buttons. This enhancement lets you run custom logic on button actions, giving you greater flexibility and control over your user interactions.
                                  • Zoho Mail not working

                                    Zoho Mail not working
                                  • I can't add a new customer in Zoho invoice? Anyone had this issue before?

                                    Ive been using Zoho invoice for over 6 years. Today I wanted to add a new customer to send an invoice to but it doesn't save when I try to access it from the pulldown menu when you go to send a new invoice.
                                  • Spreadsheet View click & focus issue in Arabic (RTL) localization

                                    Hello Zoho Support Team, I am facing an issue in Zoho Creator Spreadsheet View when using Arabic localization (RTL). Scenario: My app supports English (LTR) and Arabic (RTL). I created a Spreadsheet View for a form. In English, everything works correctly.
                                  • Customer address in Zoho Bookings

                                    Hello,  Is it possible to add customer address information to the Zoho bookings appointment screen? Or have it pull that information automatically from the CRM? We are wanting to use this as a field management software but it is difficult to pull the address from multiple sources when it would be ideal to have a clickable address on the appointment screen that opens up the user's maps.  It would also be advantageous for the "list view" to show appointment times instead of just duration and booking
                                  • Ghost email notification on a form

                                    Hello, We have recently encountered an error where I can not see a email notification set up for a form which I am currently the owner, although neither the form nor the notification were created by me. However, neither can the Super Admin access the
                                  • bulk edit records and run internal logic

                                    hi there is few logics in manner "it this than that" logics work well when i edit entry openning it one by one (via workflow "on add/edit - on success" , for custom field "on update/on user input") but when i try bulk edit records - logic does not work.  how can i turn on logic to work as programmed - for mass editing records via bulk edit?
                                  • Bulk bank rule creatioin

                                    Hi team, I am exploring Option to create a multiple bank rule. Could please suggest the option to implement this?
                                  • Limitations on editing a message in Cliq

                                    Hi I've checked the documentations and there's no mention of how many times a message can be edited. When trying with code, I get various numbers such as ~1000 edits or so. Please mention if there's a limit on how many times one can change a message via
                                  • email address autocomplete

                                    Is there a way to eliminate certain addresses from showing up in auto complete when entering an address? Many old and unused addresses currently show up, many of which I would like to get rid of. Thanks
                                  • How to use MAIL without Dashboard?

                                    Whenever I open Mail, it opens Dashboard. This makes Mail area very small and also I cannot manage Folders (like delete/rename) etc. I want to know if there is any way to open only Mail apps and not the Dashboard.
                                  • How can i download and secure all my mails from the archive folders?

                                    Hi, i would like to download all my mails from my archive folders and secure it on my external HDD. Is this possible? Thx. amir
                                  • How to open filtered report in popup using Zoho Creator Deluge?

                                    First report: There is so many records in Report, If I click one record, pop up is occur. Second report (Pop up): there is also so many record data, and this pop up is also Report, not Form. First report: It has got "Sales Order" field. when I click any
                                  • Can you default reports/charts to report the current week?

                                    Our data table maintains two years of data. Management wants certain report to automatically filter the report to the latest calendar week. I know I can do this manually with filters but I want the report to automatically default to the latest calendar
                                  • Rendering PDF to view on page

                                    My company upload lots of PDF files onto Zoho. But every time we open it, it downloads the file instead of viewing it on the web page. Does Zoho allow uploaded PDF files to be rendered to view on web page yet? I've been trying to use <embed> or <object> but it cannot be loaded.  (similar thread: https://help.zoho.com/portal/community/topic/how-to-open-a-pdf-file-of-a-view-in-preview-mode)
                                  • Overlapping Reports in Dashboards

                                    It's rare, but occasionally it would be a good feature if I were able to overlap reports, either fully or partially in the Dashboards. Also, then having the ability to move objects to the front or rear, or make them transparent/translucent would be good
                                  • Feature request - pin or flag note

                                    Hi, It would be great if you could either pin or flag one or more notes so that they remain visible when there are a bunch of notes and some get hidden in the list. Sometimes you are looking for a particular name that gets lost in a bunch of less important
                                  • Admin guide: Handling Mailbox Settings for better user management

                                    Managing day-to-day email scenarios, such as supporting users with multiple email addresses, ensuring uninterrupted email access during employee absences, enabling secure mailbox sharing, and enforcing organizational security and compliance, can be challenging
                                  • Cisco Webex Calling Intergration

                                    Hi Guys, Our organisation is looking at a move from Salesforce to Zoho. We have found there is no support for Cisco Webex Calling however? Is there a way to enable this or are there any apps which can provide this? Thanks!
                                  • Designing a practical Zoho setup for a small business: lessons from a real implementation

                                    I recently finished setting up a Zoho-based operating system for a small but growing consumer beauty business (GlowAtHomeBeauty), and I wanted to share a practical takeaway for other founders and implementers. The business wasn’t failing because of lack
                                  • DKIM (Marketing emails) UNVERIFIED (Zoho One)

                                    I'm having a problem with Zoho One verifying my Marketing Email DKIM Record for MYFINISHERPHOTOS.COM. I have removed and re-entered the ownership, DKIM (Transactional emails), SPF and Marketing DKIM and all of them come back verified except the DKIM (Marketing
                                  • Zoho Recruit Community Meet-up - India

                                    Namaste, India. 🙏🏼 The Zoho Recruit team is hitting the road—and we 're absolutely excited behind the scenes. Join us for the Zoho Recruit India Meet-up 2026, a morning designed to make your recruiting life easier (and a lot more effective). Date City
                                  • Generate a Zoho Sign link

                                    From time to time I get a response "I never received your you e-document for electronic signature" is there a way to generate a Zoho Sign link to share.
                                  • Is it possible to create a word cloud chart in ZoHo Analystics?

                                    Hi there, I have a volume of transaction text that I would like to analyse using word cloud (or other approcah to detect and present word frequency in a dataset). For example, I have 50,000 records describing menu items in restaurants. I want to be able
                                  • How to Fix the Corrupted Outlook 2019 .pst file on Windows safely?

                                    There are multiple reasons to get corrupted PST files (due to a power failure, system crash, or forced shutdown) and several other reasons. If You are using this ScanePST.EXE Microsoft inbuilt recovery tool, it only supports the minor corruption issue
                                  • [Webinar] A recap of Zoho Writer in 2025

                                    Hi Zoho Writer users, We're excited to announce Zoho Writer's webinar for January 2026: A recap of Zoho Writer in 2025. This webinar will provide a recap of the features and enhancements we added in 2025 to enhance your productivity. Choose your preferred
                                  • How to drag row(s) or column(s)?

                                    Hi. Selecting a row or column and then dragging it to a new position does not seem to work. Am i missing something or this is just not possible in Zoho Sheet? Cheers, Jay
                                  • Building Toppings #5 - Creating and configuring custom service connections in Bigin Toppings

                                    Hello Biginners, Integrating Bigin with external applications extends its capabilities and enables customized functionalities. In our last post, we saw how to create a default service connection. Today, we'll see how to create a custom service connection
                                  • Optimising CRM-Projects workflows to manage requests, using Forms as an intermediary

                                    Is it possible to create a workflow between three apps with traceability between them all? We send information from Zoho CRM Deals over to Zoho Projects for project management and execution. We have used a lookup of sorts to create tasks in the past,
                                  • Marketing Tip #15: Rank better with keyword-rich URLs for product pages

                                    Your product page URL is a small detail that can make a surprisingly big difference. Clean, readable URLs help in two ways: They’re easier for customers to trust and remember (no one likes clicking a link that looks messy or random). They help search
                                  • Conditional fields when converting a Lead and creating a Deal

                                    Hi, On my Deal page I have a field which has a rule against it. Depending on the value entered, depends on which further fields are displayed. When I convert a Lead and select for a Deal to be created as well, all fields are shown, regardless of the value
                                  • ATE Session on Payment Gateways: Our experts are live now. Post your questions now!

                                    Hello everyone, Our experts are all excited to answer all your questions related to payment workflows. Please feel free to join this session and learn more about this topic. If you have a query at anytime, please post them here.
                                  • Upload data deleted all Zoho form data that we manage

                                    Good morning. Let me introduce myself, I'm Iky from Indonesia. I'm experiencing an error or problem using Zoho Forms. I manage Zoho Forms, but I previously encountered an error when I misclicked the delete button in the upload format. It apparently deleted
                                  • ZOHO FORMにURL表示ができない

                                    初心者です。 ZOHO FORM で宿泊者名簿を作っています。 ゲストが、URLをクリックするとStripeで支払いができるようにURLを表示をしたいのですが、 上手くできません。 やり方が分かる方、ぜひ教えてください。
                                  • Custom module - change from autonumber to name

                                    I fear I know the answer to this already, but thought I'd ask the question. I created a custom module and instead of having a name as being the primary field, I changed it to an auto-number. I didn't realise that all searches would only show this reference.
                                  • No Automatic Spacing on the Notebook App?

                                    When I'm adding to notes on the app, I have to add spaces between words myself, rather than it automatically doing it. All my other apps add spacing, so it must be something with Zoho. Is there a setting I need to change, or something else I can do so
                                  • Holidays - Cannot Enter Two Holidays on Same Day

                                    I have a fairly common setup, where part-time employees receive 1/2 day's pay on a holiday and full-time employees receive a full day's pay. Historically, I've been able to accommodate this by entering two separate holidays, one that covers full-time
                                  • Zoho Bookings and Survey Integration through Flow

                                    I am trying to set up flows where once an appointment is marked as completed in Zoho Bookings, the applicable survey form would be sent to the customer. Problem is, I cannot customise flows wherein if Consultation A is completed, Survey Form A would be
                                  • Campaigns set up and execution assistance

                                    Hello Community, Can someone recommend a professional who can assist with the completion of my set up and deployment of Campaigns? Looking for a person or company that is not going to ask for big dollars up-front without a guarantee of performance to
                                  • Zobot with Plugs

                                    Hello, I am having a problem with Zobot using Plugs. Here is my current flow: When I run the flow, I should immediately see the messages from the initial cards (Send Message cards), then after running the plug, and finally, see the messages after the
                                  • Next Page