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It looks like your IP (37.143.82.179) is blacklisted.

I get error:

Reporting-MTA: dns; smtp04.glasoperator.nlX-Postfix-Queue-ID: B7B1C1A2D47X-Postfix-Sender: rfc822; <my sender e-mail>Arrival-Date: Thu, 27 Jul 2023 12:56:37 +0200 (CEST)Final-Recipient: rfc822; <my recipient e-mail>Original-Recipient: rfc822<my recipient e-mail>Action: failedStatus: 5.5.0Remote-MTA: dns; kmx.poczta.onet.plDiagnostic-Code: smtp; 220-mx.poczta.onet.pl ESMTP 521 5.7.1 Service    unavailable; client [37.143.82.179] blocked using    artemida.opbl.onet.pl.local

Hi @MMMerlin, welcome to our Community!

I'd be happy to look into this for you, could you give me a bit more context? When are you getting this message and are you getting this with every mail?

 

I’m getting it with every mail I sent through SMTP of glasoperator to address @onet.pl.

This is since few days.

I checked that the IP address of glasoperator is blocked as a spam at least in SORBS SPAM (Accoring to MXToolbox page).

 

@MMMerlin thanks for your quick response. I have passed this on to our technicians. You will be contacted when more is known about this. To be continued.

@Tommie thank you for help.

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