Email relay issue, emails don't deliver

[Lanhild]

Hello,

I've been searching all around about an issue I have with Cloudron and the email relay.

For context:

• Email domain is ca.example.com
• App domain is cal.my.example.com
• Cloudron domain is my.domain.com
• DNS is DigitalOcean

I'm using Mailgun as my email service, and setup ca.example.com as the email domain on Mailgun. I've followed all their instructions about adding the required DNS records.

I then added the email relay in Cloudron using my SMTP credentials. Connection successful, but emails don't deliver at all.

I'm getting the following error:

Any clues? I'm really confused here.
Regards.

[robi]

It doesn't like that your email domain does not match your cloudron sender domain.

[girish]

@Lanhild said in Email relay issue, emails don't deliver:

Email domain is ca.example.com
App domain is cal.my.example.com
Cloudron domain is my.domain.com

(Assuming, none of the above are typos... For example, app is really in cal.my.example.com and not cal.example.com?)

If you added ca.example.com in mailgun, you can only send emails from *@ca.example.com . When an app tries to send email it will send it as MAIL FROM: app@cal.my.example.com . This will go to the relay and the relay will reject it. Auth will succeed but the MAIL FROM is not matching.

To fix, they need to match. For example, add ca.example.com as a Domain on Cloudron. Then, it will appear in the Email view. Configure mailgun as relay for this Email domain. Then, configure the App -> Email section -> choose ca.example.com as the MAIL FROM.

[Lanhild]

@girish Perfect, that solved it. Thanks!