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Error : said: 451 4.4.0 detected undelivered mail to

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Hi,

I have some trouble with specific email from a marketing sending.

Here's the output of tracking center

Code:
Jan 12 16:12:55 myHostname postfix/qmgr[907477]: C3B9A3E75: from=<sender>, size=28757, nrcpt=1 (queue active)
Jan 12 16:12:57 myHostname postfix/lmtp[1079237]: C3B9A3E75: to=<recipient>, relay=127.0.0.1[127.0.0.1]:10024, delay=25972, delays=25970/0/0.04/1.3, dsn=4.4.0, status=deferred (host 127.0.0.1[127.0.0.1] said: 451 4.4.0 detected undelivered mail to <recipient> (in reply to end of...

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