Duplicate Email Notifications when using ZeptoMail SMTP in Frappe

Frappe Framework
1

I’ve integrated ZeptoMail SMTP with Frappe for sending email notifications.
The configuration works — emails are delivered successfully — but I’m facing an issue where duplicate emails are sent for the same notification.

details:

  • I have a Notification set up for the Lead doctype that sends an email to all users with the System Manager role whenever a new Lead is created.

  • Here’s the issue I’m facing:

    • If there are 4 users with the “System Manager” role, each user receives 4 duplicate emails.

    • When I add a 5th user, each of them receives 5 duplicate copies of the same notification.

    • In Frappe’s Email Queue, only one email record is created per event.

    • However, in ZeptoMail’s transaction logs, I can see multiple identical deliveries (4 copies) of the same message, only seconds apart.

    • When I switch the outgoing server to Zoho SMTP (smtp.zoho.com) using the same configuration and notification setup, the issue disappears completely — no duplicate emails are sent.

    So this duplication only occurs when using ZeptoMail SMTP (smtp.zeptomail.com).

Expected Behavior:
Each recipient should receive one email per notification event, regardless of the SMTP provider.

Note:
This domain is configured as outgoing-only (no incoming mail for noreply@example.com).
To bypass Frappe’s mandatory “Incoming Server” field for Email Domain, I temporarily entered
imap.zoho.com while keeping the outgoing server as smtp.zeptomail.com.

2

The Email Queue has the subject and recipients as expected?

If so, maybe its an issue at your provider’s end, since Zoho worked fine.

3

Yes, that’s correct.
As I mentioned, in Frappe’s Email Queue, only one email record is created per event, so everything is working as expected on that end. The issue, however, lies with ZeptoMail.

4

Yes, that’s correct.
As I mentioned, in Frappe’s Email Queue, only one email record is created per event, so everything is working as expected on that end. The issue, however, lies with ZeptoMail.