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Re: SMTP server error message

From: Florian Weimer
Subject: Re: SMTP server error message
Date: Sat, 31 May 2014 16:27:47 +0200

* Eli Zaretskii:

>   451 4.0.0 Spam filter end message failed - server - license [slot 1]

> What does that response mean, and what can I do to avoid it (apart
> of hacking smtpmail)?

Looks like a problem at your ISP.  They probably have a cluster node
that is broken, and sending again hits a node that works.

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