Freezing occurs when a bounce message encounters a permanent failure because the sender address of the original message that caused the bounce is invalid, so the bounce cannot be delivered.
My guess is that you need to change the notification email address or configure exim to use your subdomain
Exim4 was tested to verify it sends and receives emails.
Discourse was rebuilt with discourse-setup, using all the correct credentials:
Hostname : forum domainname com
Email : user@test com
SMTP address : mail forum domainname com
SMTP port : 587
SMTP username : postmaster@forum domainname com
SMTP password : password
Then, discourse-doctor is run to test weather Discourse can send email from the local exim4 mail server.
Discourse-doctor says:
“SMTP server connection successful.”
“Sending mail failed.”
However, there are no errors in the exim4 log.
Why does sending mail fail?
Is this a common problem?
Notice that the SMTP address is: mail forum domainname com,
should it have “mail” at the beginning?
Discourse-doctor says that Discourse does connect to:
mail forum domainname com,
but Discourse does not send the email.