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I have A Ubuntu Server on which im Using Roundmail for my Email Service.

Basically i Can receive Emails and send emails to f.e. @gmail.com but not for other domains.

instead im Just getting 

host mail-01.dd24.net[193.46.215.141] said: 550 5.7.1
Service unavailable; client [77.68.4.36] blocked using cbl.abuseat.org (in
reply to RCPT TO command)

Final-Recipient: rfc822; domain@domain.info
Original-Recipient: rfc822;domain@domain.info
Action: failed
Status: 5.7.1
Remote-MTA: dns; mail-01.dd24.net
Diagnostic-Code: smtp; 550 5.7.1 Service unavailable; client [77.68.4.36]
    blocked using cbl.abuseat.org

but when im sending f.e. from my gmail to my domain@domain i can receive it

anybody having an Idea?

ScarVite
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  • Try checking your outgoing mail domain and mailserver IP against black lists and request removal if blacklisted. https://mxtoolbox.com/blacklists.aspx – Nick Surmanidze Mar 09 '20 at 09:19
  • I Just checked an my IP is blacklisted on CBL and Spamhaus ZEN – ScarVite Mar 09 '20 at 09:22
  • Each blacklist usually has a website and a form where you request removal from the black list. So go ahead and do that. After some time your mailserver should be fine unless it's a shared server and someone else is sending spam from it. – Nick Surmanidze Mar 09 '20 at 09:23
  • {IP} was found to be using the following name as the HELO/EHLO parameter during connections: "localhost.localdomain". – ScarVite Mar 09 '20 at 09:41

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