SM 8566: In the Spool queue I see a lot of this: "Error: 452 4.1.0 ... sender rejected (too busy for now)"

SM 8566: In the Spool queue I see a lot of this: "Error: 452 4.1.0 ... sender rejected (too busy for now)".

In previous SM builds I never saw these errors (or maybe they were so few that I didn't have time to notice them...).

What do they mean?

Is it a SmarterMail problem, or does it depend on something else?

Thanks in advance.

Gabriele Maoret - Head of SysAdmins at SERSIS

Currently manages 6 SmarterMail installations (1 in the cloud for SERSIS which provides services to a few hundred third-party email domains + 5 on-premise for customers who prefer to have their mail server in-house)

Douglas Foster Replied

6/21/2023 at 1:23 PM

My guess is that the recipient system uses graylisting to see if you are a spammer. Perhaps the new SM documents the event more thoroughly prior versions.

Gabriele Maoret - SERSIS Replied

6/21/2023 at 2:34 PM

Marked As Answer

Hi Douglas!

Yeah, I think so...

Investigating further, I find out that all that log messages are related to a single (big, here in Italy...) provider that recently changed his greylisting policy...

So this is not an issue, SmarterMail is working OK!

Gabriele Maoret - Head of SysAdmins at SERSIS Currently manages 6 SmarterMail installations (1 in the cloud for SERSIS which provides services to a few hundred third-party email domains + 5 on-premise for customers who prefer to have their mail server in-house)

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