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Google is also rejecting SMTP ingress traffic.

(delivery temporarily suspended: lost connection with aspmx.l.google.com[2a00:1450:400c:c04::1b] while sending DATA command)



That is Really Bad™.

People are going to miss critical emails with no recovery.


Fortunately email was designed back in a day when mail servers could fail. Don’t worry - proper SMTP servers will retry patiently.


These are temporary deferrals, a properly configured outbound mailserver should retry for days.


Emails will be delayed but sending SMTP servers have a retry mechanism up to a few days.




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