Mail being sent from invalid domains

[Haw Loeung]

Hi,

Per our internal Mattermost, mail from the importds (production, staging, and qastaging) are being rejected because they're being sent from invalid / non-resolvable domains.

For production:

| Aug 22 07:28:59 juju-c4acfb-prod-lists-canonical-com-57 postfix/smtpd[28188]: NOQUEUE: reject: RCPT from unknown[10.131.241.217]: 450 4.1.8 <email address hidden>: Sender address rejected: Domain not found; from=<email address hidden> to=<email address hidden> proto=ESMTP helo=<juju-1e3bde-prod-lp-code-import-15.None>

The "None" domain is likely userdir-ldap related.

For staging:

| Aug 22 07:26:28 juju-c4acfb-prod-lists-canonical-com-57 postfix/smtpd[27672]: NOQUEUE: reject: RCPT from unknown[185.125.191.62]: 450 4.1.8 <email address hidden>: Sender address rejected: Domain not found; from=<email address hidden> to=<email address hidden> proto=ESMTP helo=<juju-4f79f3-staging-1.canonical.com>

For QAstaging:

| Aug 22 07:26:11 juju-c4acfb-prod-lists-canonical-com-57 postfix/smtpd[27302]: NOQUEUE: reject: RCPT from unknown[185.125.191.62]: 450 4.1.8 <email address hidden>: Sender address rejected: Domain not found; from=<email address hidden> to=<email address hidden> proto=ESMTP helo=<juju-0389c7-qastaging-0.canonical.com>

I've filed this bug against this project as per cjwatson.

Maybe they should be sending using the <email address hidden> address via the new SMTP relays (launchpad.smtp.canonical.com).