Hi,
I have this problem: I configured Sendgrid as an SMTP relay for a domain and everything works fine except if I activate an auto-forward of an email box to an external email.
In this case every email received is not forwarded to the final email and I get this error:
This is the mail system at host <mailcow-email-server>.
I'm sorry to have to inform you that your message could not
be delivered to one or more recipients. It's attached below.
For further assistance, please send mail to postmaster.
If you do so, please include this problem report. You can
delete your own text from the attached returned message.
The mail system
<final-recipient-email-address>: host smtp.sendgrid.net said: 550
The from address does not match a verified Sender Identity. Mail cannot be
sent until this error is resolved. Visit
https://sendgrid.com/docs/for-developers/sending-email/sender-identity/ to
see the Sender Identity requirements (in reply to end of DATA command)
Have any of you had the same problem and/or do you have any suggestions?
Thank you!
Best regards,
Giorgio