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

    • Showing the map along with mileage expense

      When you use the GPS to track mileage, it shows you the map of the actual path travelled. It would be very useful and practical to save that map with the mileage expense, so that when the report is created, it provides a map of each mileage expense associated

    • ID:2406331

      Hello, I have sent the form (ID:2406331) but no answer after two days. This is a paid subscription, I am not allowed to use the eighth paid slot of 50GB email space anymore, only 7 are being used. Is anyone going to help me please so I can use the eighth

    • CRM x WorkDrive: File storage for new CRM signups is now powered by WorkDrive

      Availability Editions: All DCs: All Release plan: Released for new signups in all DCs. It will be enabled for existing users in a phased manner in the upcoming months. Help documentation: Documents in Zoho CRM Manage folders in Documents tab Manage files

    • Approval Workflow for Purchase Orders Abrir

      The requirement is , that all purchase orders greater than or equal to 5000 go through an approval process from certain people, but within books I only see that the approvers can be by levels or any approver but we cannot enter a rule like these. Can

    • I would like to know wich person viewed the file

      I have a franchise and my Operative Manual is in WorkdriveI, the user can´t download but despite I know How many views the file had, I would like to know wich person viewed the file Is it possible? thank you

    • Transaction Rule Matching

      Q1. Is there a method to have the Transaction Rules applied across multiple Bank Accounts? Q2. To match "contains" text in Transaction Rules, is a wildcard or regular expression required? Is it case sensitive? Would searching for "issue" in the following

    • Zoho Desk - Event Calendar View

      Hi Desk team, Are there any plans to introduce a calendar or timeline view for Events in Zoho Desk? It would be very helpful if we could see Events visually in a calendar and/or timeline. This is very helpful when desk side support activities need to

    • Notebook on Mac: Fuzzy fonts in list view

      Hi, I am running Notebook on Mac OS 26. Generally it works fine, and the font display in the notes themselves is crisp. However, in the notes list (left of the open note) the font of the note titles as well as first lines is noticeable fuzzy. Attached

    • Trigger workflows from SLA escalations in Zoho Desk?

      Hey everyone, I’m currently working with SLA escalation rules in Zoho Desk and ran into a limitation that I’m hoping someone here has solved more elegantly. As far as I can tell, SLA escalations only support fairly limited actions (like changing the ticket

    • Zoho CRM Email Templates 100% Width No Background How?

      Hi, On the Zoho CRM Email Templates in setup > customization > templates > new templates > I choose blank template, but still it puts in a gray background and a max width for the email. I just want to make an email that looks like an email I would send from gmail that has no background or max width. How do you do this? 

    • ZOHO CRM Quote Export / Quote Report

      How can I either Export my quote list, or create a Report that shows all quotes AND includes the NOTES field in a column. I attempted to Run a Report which includes ALL FIELDS, however it does not include the Notes Field (but oddly does include the fields

    • Introducing Radio Buttons and Numeric Range Sliders in Zoho CRM

      Release update: 1. 2 March 2026: Currently out for CN, JP, AU and CA DCs (Free and standard editions). For other DCs, this will be released by mid-March. 2. 26 March 2026: CA, SA, AU, JP, CN DCs - Free, Standard, Professional, Enterprise, Ultimate, CRM

    • All new Address Field in Zoho CRM: maintain structured and accurate address inputs

      Availability Update: 29 September 2025: It's currently available for all new sign-ups and for existing Zoho CRM orgs which are in the Professional edition exclusively for IN DC users. 2 March 2026: Available to users in all DCs except US and EU DC. 24

    • Re-Apply SLA When Ticket Reopened from Closed Status?

      If you have an SLA applied, timers are deactivated when going to "On Hold" status type and reactivated when going back to an Open status type. What we discovered is when a customer replies to a closed case and it reopens, the SLA is not applied and timers

    • Option to Delete Chats in IM

      Currently, there is no option to delete any chats in IM, regardless of their source.

    • Adding a Mark Up

      Can you use the discount column to be a mar up column on estimates and invoices?

    • URGENT. Recovering email without eArchive

      Hello, I have deleted some email from my trash but do not have eArchive. Is it possible to recovery without this? many thanks!

    • Subscription Statuses - Dunning

      How are other companies handling the scenario when customers don't pay and dunning takes over? Our issue is that in my situations, we want our customers to be able to catch up their late payments and continue their subscription after the dunning process

    • Logo Doesnt appear on email

      Hi, 1. PROBLEM: mails sent to customer from zoho invoice ( Estimates and incoices etc.) Logo doesnt appaer on email. 2. SUGGESTION: there must be an option to select from google fonts if we want specific font to the pdf templates. thanks

    • How to see Statement Details Shown in Unclassified Transactions in All Transactions?

      All, The list of Unclassified Transactions show the Statement Details and Descriptions. What is the method to see that column in the All Transactions list? -Thanks!

    • Non-Avalara Tax Automation wtih Zoho Books

      We are paying a ridiculous amount for Avalara. Our team wants to make a change, but they're the only software fully integrated with Zoho. We also don't have the bandwidth to do this manually, so we do need some sort of automated software solution. We

    • Migrating to the new outgoing webhook model in Zoho Connect

      Dear User, Outgoing webhooks configured across the Zoho Connect Integrations page, Zoho Flow, and Zapier will stop working after May 31, 2026. This is due to an upcoming upgrade to our outgoing webhook flow. This update is mandatory only for networks

    • Create formula calculations in Assemblies for scaling quantities

      Something we have been encountering with our composite items is dealing with scaling of quantity of one or more items within the composite assembly relative to the number of complete units being sold. I.e. running the equation 2(n-1) on one of the assembly

    • Lastest update

      The latest update to notepad has completely trashed all my notes. If I go to view it it just opens up a screen with a box with dotted lines around it for me to add something I can import saved nodes but you can't view them at all. Anybody else having

    • Is it possible to make tags "required"

      We would like to be able to make the tag field a requirement for agents before they can close a ticket. This would help with monthly reporting, where a lot of tickets end up with no tag, causing manual work to go back and add the correct tag for each

    • Tip #67- Exploring technician console: Disable Input Devices- 'Insider Insights'

      Hello Zoho Assist Community! Picture this: you are in the middle of a critical remote session, carefully configuring a system or running an important update, and the customer accidentally clicks somewhere or types something that undoes your progress.

    • What matters more in Zoho implementations: tools or system architecture?

      I recently worked on a full-stack migration for a catering equipment business using Zoho One with Shopify, and it raised a few interesting observations. The setup included migrating a large product catalog (around 9,700+ SKUs), integrating multiple supplier

    • Facturation électronique 2026 - obligation dès le 1er septembre 2026

      Bonjour, Je me permets de réagir à divers posts publiés ici et là concernant le projet de E-Invoicing, dans le cadre de la facturation électronique prévue très prochainement. Dans le cadre du passage à la facturation électronique pour les entreprises,

    • [Webinar] Solving business challenges: One tool for documents, forms, PDFs, e-signatures, and more

      Hi Zoho Writer users, Most businesses rely on multiple tools, such as a word processor, form builder, e-signature provider, and PDF editor, for their document workflows. Managing multiple subscriptions, switching between tools, and moving data across

    • Deposit on invoice

      I'm trying to figure out how to customize an Estimate to include a Deposit/Retainer Invoice line within the Estimate. I tried creating my own custom field called "Deposit" where I manually inputted the deposit amount, which was nice. However, my employer

    • Zoho NOTEBOOK: What are file size restrictions?

      I understand that Zoho NOTEBOOK is a free product, and what it offers is great. But I'm wondering what the file size restrictions are. When I record an audio note in Zoho Notebook, what is the maximum length of recording time/audio file size? When I wish to upload MP4 video, what is the maximum video size I can upload per Zoho Notebook restriction? Moreover, does Zoho Notebook use its own storage structure, or can I upgrade my storage for Zoho Notebook to add larger file attachments, videos and audio

    • Concern Regarding Stock Validation in Inventory Management

      Hi Zoho Team, We would like to highlight a concern regarding stock validation in the inventory system. As per standard inventory management practices, if the stock level is zero, the system should not allow users to create a shipment, packing slip, or

    • Automation Series #2: SLA vs Supervisor Rule in Zoho Desk

      SLA vs Supervisor Rule: Keeping tickets on track in Zoho Desk This post is part of the "Desk Automation Series," Chapter 1. Through this series, we will help you choose the right automation type in Zoho Desk by comparing commonly confused automations

    • Zoho Recruit - Email Relay

      Good day, Has anyone succeeded in setting up an email relay for Office 365? If I add the details from https://support.microsoft.com/en-us/office/pop-imap-and-smtp-settings-8361e398-8af4-4e97-b147-6c6c4ac95353, I get the connection error. Regards, Eka

    • Better use of contacts

      Zoho inventory has the ability to add multiple contacts to customers. However Zoho inventory doesn't currently provide a way to link a contact to objects like sales orders. This means that while you can tell what company has placed a sales order you can't

    • Notebook AI limits

      Hi folks, Working with the AI transcription tools in Notebook, on the Mac App, which I find quite handy, but the one thing I am struggling with is the inability to either edit or copy the results of the transcript: I can't click in any of the boxes, and

    • Disappointment with Zoho Payments

      Dear Gowdhaman, I am writing to inform you that I am removing Zoho Payments from my website. I cannot continue to disappoint my customers due to the lack of UPI support, as has been the case with my experience so far. Please note that the 0.5% transaction

    • Zoho Commerce B2B

      Hello, I have signed up for a Zoho Commerce B2B product demo but it's not clear to me how the B2B experience would look for my customers, in a couple of ways. 1) Some of my customers are on terms and some pay upfront with credit card. How do I hide/show

    • Exporting All Custom Functions in ZohoCRM

      Hello, All I've been looking for a way to keep about 30 functions that I have written in Zoho CRM updated in my own repository to use elsewhere in other instances. A github integration would be great, but a way to export all custom functions or any way

    • Rename system-defined labels in Zoho CRM

      Renaming system-defined labels is now available across all DCs. Hello everyone, Zoho CRM includes predefined system fields across modules to support essential CRM operations. Until now, the labels of these fields were fixed and could not be edited from

    • Next Page