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Using calendar notifications for a custom domain. We have SPF, DKIM and DMARC correctly setup and they work great for email sent directly by users. 

However, notifications sent by calendar events always fail the DMARC check. Even though both SPF and DKIM pass, the DMARC check fails and I understand that it's because the envelope sender is different from the header sender. Envelope uses something like @sender.zohocalendar.com, while the header sender is the users own email.

This makes it impossible to switch the DMARC policy from "none" to anything higher and is a major issue that prevents us from moving the while organization mail to Zoho.

Any help or ideas are greatly appreciated.

3 users have this problem.
9 Replies
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  • 2 years ago

@Andreas,

Greetings from Zoho Calendar support.

It looks like DKIM is not enabled for the invites which are sent from Calendar. We have sent you an email with the TXT record that has to be added in the domain's DNS panel.
Once it is done, do let us know (by responding back to the same email). We will cross check and verify. After that, the invite emails will be properly authenticated at the recipients end.

Regards,
Favin

  • 2 years ago

Hello,

I am experiencing this issue within my organisation. Can you please share the fix for this. Thank you.

  • 2 years ago

@Taofeek,

Based on your request, we have shared the DKIM public key in an email to your account. Please add it as a TXT record in your domain's DNS page and respond back to our email.

Looking forward to your response.

Regards,
Favin

We have the similar issues where our responses to calendar invites are being considered at not DMARC compliant. Please help.

This is an authentication failure report for an email message received from IP
135.84.80.169 on Tue, 8 Oct 2024 08:12:53 +0200 (CEST).
Feedback-Type: auth-failure
Version: 1
User-Agent: OpenDMARC-Filter/1.4.0
Auth-Failure: dmarc
Authentication-Results: coe-dmarc; dmarc=fail header.from=oomnis.com
Original-Envelope-Id: DB3D33F826
Original-Mail-From: noreply+30fb4400-853c-11ef-96c2-525400d6cd4f_vt1@sender.zohocalendar.com
Source-IP: 135.84.80.169 (bmail-169.transmail.net)
Reported-Domain: oomnis.com 

Hi I'm having the exact same issue with Zoho People notification emails. Please help me to resolve it by providing necessary DKIM, SPF records to add.

  • 1 year ago

Hello Lahiru,

Greetings from Zoho people,

Please find the below link for the help documents on DKIM authentication. Please write to support@zohopeople.com if you have any queries so we shall assist you accordingly. 
Link : Click here for the help documents. 

Regards, 
Karthik Raja A.

  • 4 months ago

Hello @Guillaume Proux

The recipient's server will validate the authentication for incoming emails, and if it fails, the emails will be rejected and bounced back according to the sender domain's DMARC policy.

To ensure that invites sent using Zoho Calendar are properly authenticated, please refer to the instructions in this help link  - https://www.zoho.com/calendar/help/adminconsole/domain-configuration.html.

For additional assistance, feel free to email support@zohomail.com.

Regards,
Sagar | Zoho Cares

Hi Sagar,

I haven't had any issues with regular emails, but when I recently responded to a Zoho Calendar invitation, that received 50% compliance due to *.transmail.net having a 0% compliance rate. Is that something from my end which can be fixed?

  • 3 months ago

Hello @Michael Gauci

Please ensure the DKIM is configured for the emails sent using Zoho Calendar. Refer to the instructions in this help link - https://www.zoho.com/calendar/help/adminconsole/domain-configuration.html.

In-case of further queries, please drop an email to support@zohocalendar.com.

Regards,
Sagar | Zoho Cares

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