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Resolved Email is being deferred 4.3.2

silvermarbles_ltd

New Pleskian
Server operating system version
CentOS Linux 7.9.2009 (Core)
Plesk version and microupdate number
Plesk Obsidian 18.0.67 Update #3 Web Host Edition
Hello

All of sudden no email is being delivered or sent via my server. All emails are in the queue as deferred.
Error is 4.3.2 deferred (host 127.0.0.1[127.0.0.1] said: 421 4.3.2 Service shutting down, closing channel (in reply to RCPT TO command))
I have installed Plesk Email Security (paid monthly version) as I was reading some other threads had this installed to resolve a similar issue but nothing has changed.
Do I need to restart the service? If so, how and what is the best thing to get the service back up and running again please?
Thank you
 
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