Net::SMTPServerBusy: 450 4.7.1 <localhost.localdomain>: Helo command rejected: Host not found

[mvl22]

Rollbar is reporting:

Net::SMTPServerBusy: 450 4.7.1 <localhost.localdomain>: Helo command rejected: Host not found

MB say:

It looks like you're connecting to localhost.localdomain which I'd normally expect to see in /etc/hosts. It's not on your machine, do you want to 

(a) add localhost.localdomain to the hosts file?
(b) reconfigure to send to localhost in your app?

[mvl22]

Last mail delivery for me was Thu, 17 Nov 2022 13:51:38 +0000.

What was deployed shortly after that time?

[nikolai-b]

Sorry I'm poorly or I'd have instigated on Fri. Master / cyclescape hasn't been deployed by me since Sep 7th. I'm redeploying now to see if that fixes anything.

[nikolai-b]

Re-deploy didn't work, I've replied to MB with the mail log as it looks like postfix restarted then and was broken after the restart.

[mvl22]

I believe mail is now coming through as normal - is that right?