Hi. I run MIAB on Linode, and today migrated my 0.30 instance to 0.40 on a new Linode 1GB instance. The upgrade process and backup/restore process all worked without errors, and my new instance is receiving mail correctly. However, I am unable to send mail to any domain other than my own. The error I see on the mail client (Roundcube or Thunderbird) when sending is:
SMTP Error (550): Failed to add recipient “recipient-email-redacted” (5.1.1 <recipient-email-redacted>: Recipient address rejected: recipient-domain-redacted).
On the server’s mail.log, I see:
Jan 19 21:54:06 my-hostname-redacted postfix/submission/smtpd: NOQUEUE: reject: RCPT from localhost[127.0.0.1]: 550 5.1.1 : Recipient address rejected: recipient-domain-redacted; from= to= proto=ESMTP helo=
I’ve re-run the mailinabox command a few times for good measure, rebooted the server, triple-checked my DNS settings (which are hosted on an outside DNS service), etc. I’m not sure what’s wrong here. My forum searches for this error haven’t come up with much. Can anyone suggest some further things for me to try out? Thanks -ScottG