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.

    • 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

    • Recent Topics

    • RouteIQ for Zoho FSM

      Beste, Zou wel top zijn dat we een RouteIQ hebben voor FSM aangezien we constant moeten zien wat de beste route is voor onze monteurs. Nu moeten we een speciale aparte programma hebben om de beste route te berrekenen voor onze monteurs aangezien de planning

    • Export Tickets from the Help Center

      Hello everyone! We are now allowing end users to export tickets directly from the help center. The ticket export allows users to: Filter tickets by Department, Priority, and Account before exporting. Download files from Export History (Setup > Data administration

    • Super Admin Logging in as another User

      How can a Super Admin login as another user. For example, I have a sales rep that is having issues with their Accounts and I want to view their Zoho Account with out having to do a GTM and sharing screens. Moderation Update (8th Aug 2025): We are working

    • Is it possible to remove filtering options?

      My CRM has a lot of custom fields that should not be used in filters or views. Fields that are automated and exist only to store temporary values that get used in functions. These create a lot of noise in the list of fields to filter. Isn't there any

    • Function #18: Associate invoice templates automatically based on customer language

      For businesses dealing with a diverse linguistic clientele, it becomes crucial to send out invoices in the customer's preferred language to ensure effective communication. This requirement can be handled in Zoho Books by creating invoice templates in

    • Changing field types

      Question im a Zoho CRM user and curious, if I change a flied type from single or multi line text to a URL field type will i lose the data in the field or will it be converted to website link automatically. Thanks

    • Quote PDF – Header image stopped rendering suddenly

      Hello Zoho Support Team, We are facing an issue with Quote PDF templates in Zoho Books. Previously, images added inside the Quote header HTML were rendering correctly. However, recently the header image is no longer appearing, while header text still

    • Changing Default PDF Name

      Is it possible to change the default name of a PDF? As of right now, all of my quotes are named 'QT_$QuoteNumber' (i,e: 'QT_19803471298374) - would it be possible to change this to: '$CompanyName - $AccountName - $QuoteNumber' for instance?

    • Tip 2: Recursive functions in Deluge: How to dynamically run a function for a specified number of times.

      Hi folks, As part of the Zoho Creator - Tips and Tricks series every fortnight, we are back today with a new tip on Recursive functions.  Let us first quickly understand what Recursive functions are: A function that calls itself one or more times is known as a Recursive function. That is, you can execute a function to perform a particular action a specific number of times. And, at the end of each iteration, a new output is generated. Recursive functions are commonly used by programmers as it enables

    • Function #48: Manage fixed installment payments using Zoho Books

      Hello everyone, and welcome back to our series! Businesses offer installment payment options to their customers, particularly for expensive purchases, to ease the financial burden on them. By breaking down the total cost into smaller, more manageable

    • Spotlight series #6: The Show app for Android TV has a new look!

      Hello everyone! We are delighted to introduce our revamped and redesigned Show app for Android TV.  Smart TVs are exploding in popularity. Android TV alone has over 110 million active monthly devices. Zoho Show, as part of a constant effort to improve

    • Can’t create alias “Email alias already exists”

      Hi, I’m trying to create the following alias for my domain email. contact@ personal@ private@ But I get a email alias already exists. I had a soho account previously which I deleted which I suspect is causing the issue. Can someone assist? Kind Rega

    • Zoho Books integration sync from Zoho CRM does not work

      Hi Zoho Community & Zoho Support We just tried to get a sync some products into Zoho Books from CRM using the native sync and we're getting an error: "It looks like some mandatory fields you're trying to map are empty. Please provide valid field names

    • Appraisals - Order of Previous Reviews Should Be Newest to Oldest

      The new Zoho People layout generally does a decent job at providing the necessary information for performing appraisals of employee performance. One example of this is the Previous Reviews section: This information is helpful when conducting a review.

    • Paging through API results. a major gap in your documentation.

      There is no way for me. to get all of my data through a single API call. Typically REST APis have mechanisms for paging through API results. But the documentation for the API I am using: https://desk.zoho.com/DeskAPIDocument#Introduction Has no mention

    • unable to send message reason 550 5.4.6 unusual sending activity

      My email account can't send message. It shows unable to send message reason 550 5.4.6 unusual sending activity detected

    • Recurring invoices were generated with old template...

      I have recurring invoices setup. Ones generated on 10.20.2025 used the modified template I had used. But for some reason, on the ones created on 11/20/2025, it seems the invoices created reverted to the previous version of the invoice template. Notably,

    • Zoho desk desktop application

      does zoho desk has a destop applicaion?

    • Tip #54- Exploring the Files Icon in Zoho Assist- 'Insider Insights'

      As we’re already in mid-December, it’s a good time to take a closer look at one of the most useful options in the Zoho Assist remote support dashboard—the Files icon. To get started, log in to Zoho Assist using your credentials. Once you’re in, navigate

    • Tip#47: Estimation planner

      Sprint planning becomes easier, smoother, more collaborative and more accurate with the Estimation Planner extension. Most work items involve multiple users, and each user's role and effort vary. To provide an unbiased and fair estimation point to the

    • Upcoming update to Google Drive integration in Zoho Creator

      Hello everyone, We're writing to inform you about an upcoming update to how Zoho Creator integrates with Google Drive. In Zoho Creator, during actions like importing files to create an app or attaching files to fields, you can choose files directly from

    • Time Tracking on Iphone doesn't stop

      When I start a time tracking session the timer starts as expected. However when I hit stop, the timer remains on that project. The only buttons available are discard and start. Start runs the timer more and discard says it will throw away the data from

    • Zoho Sign - Zoho CRM extension upgrade

      Hi everyone, We've updated Zoho Sign extension for Zoho CRM with significant internal changes. Impact on existing Zoho Sign extension users Users using the extension without customization If you are using the integration without implementing Zoho Sign's

    • Zoho Books blocks invoicing without VeriFactu even though it is not mandatory until 2027

      I would like to highlight a very serious issue in Zoho Books for Spain. 1. The Spanish government has postponed the mandatory start of VeriFactu to January 1st, 2027. This means that during all of 2026 businesses are NOT required to transmit invoices

    • Group by Owner/ Owner Kanban /Group by Custom Field

      Hi, We are missing the option of viewing Tasks grouped by their owner, as it is an essential function for us to manage our employees' working tasks. We find it hard to inspect what are the tasks that our employees are working on.  We are seeking an option

    • Flow using way too many tasks

      I built a flow that is using way too many tasks for what it is doing. I reached out to support a week ago but never heard back so hoping the community can help. Does a filter count as a task? I am seeing tons of records filtered with < 1 Sec Time Taken

    • Regarding the integration of Apollo.io with Zoho crm.

      I have been seeing for the last 3 months that your Apollo.io beta version is available in Zoho Flow, and this application has not gone live yet. We requested this 2 months ago, but you guys said that 'we are working on it,' and when we search on Google

    • Start Workflow from Deluge Script

      I have developed a customized process from our CRM that leverages a deluge script to create a statement of work document. Once the document has been created via the merge and store function, I would like the ability to start a workdrive review & approve

    • Saved Sections?

      In sites editor, the + button reveals options to add a section, element, etc. It includes Saved Sections, but I can find no way to save a section I've already created. Otherwise, is there a way to copy a section from one page to another?

    • Marketer's Space: Unable to select a sender address? Here's the fix

      Hello Marketers, Welcome back to yet another post! So you've added a sender address in Zoho Campaigns and later found that you're not able to select it while creating an email campaign. Has this ever happened to you? If so, don't worry—you're not alone.

    • Loading Project Balances in ZOHO Books for each project

      Hello, What is the best method for loading project balances actual and budget into ZOHO books to provide tracking to our project managers. We have projects and federal awards (also treated as projects) which span multiple years. We are converting from

    • Scale up your writing style with content analysis tool in Knowledge Base

      Hello everyone, Sometimes writers may have strong knowledge about the subject but may find it challenging to articulate clearly or produce comprehensible, jargon free content. To make the process easier and to ensure consistent, high-quality articles,

    • Zoho Books "Update" Trigger for Zapier?

      Hi Zoho Team, I've been in talks with Zapier about using their services to connect my Zoho Books account to various apps, but I require an additional trigger beyond the "New" trigger. I require an "Update" trigger, which will allow me to filter and create Zaps only when certain conditions are fulfilled on the Zoho Books end before I automate a separate app. Specifically this will help me create invoices in QuickBooks Online only when payments are recorded in Zoho Books, rather than when a new invoice

    • How to prevent editing of closed tickets in Zoho Desk?

      I would like to confirm whether it is possible to completely prevent agents from editing tickets once their status is set to Closed. Is there any configuration, permission, or best practice in Zoho Desk to ensure that closed tickets remain read-only and

    • Zoho Desk Limitations

      Good day, all, I would like to know whether others share my frustration with some of Zoho's limitations. Don't get me wrong, I like Desk (and I also have a subscription for Analytics), I have been with them for close to 10 years, and unfortunately, I

    • New Mandatory One-Click Unsubscribe Link Overshadowing Custom Unsubscribe Link

      I was recently informed by Zoho CRM Support that they are now mandated by the large email service providers like Google and Yahoo to provide a one-click unsubscribe option in the header (not the body) of all mass emails. I have a custom unsubscribe link

    • how to undoreconciled transaction

      how to undo reconciled transaction

    • Can I export all attachments from Zoho CRM?

      Can I export all attachments from Zoho CRM?

    • Exciting Updates to the Kiosk Studio Feature in Zoho CRM!

      Hello Everyone, We are here again with a series of new enhancements to Kiosk Studio, designed to elevate your experience and bring even greater efficiency to your business processes. These updates build upon our ongoing commitment to making Kiosk a powerful

    • Change eMail Template for Event-Invitations

      Hello ZOHO-CRM Team How I can change the eMail Template for Event-Invitations? I work with the German Version of the Free Version. I know how I can modify eMail alerts or Signature Templates, but where I can other eMails modify you send out? Thank you for your answer. Regards, Juerg

    • Next Page