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Gmail/yahoo blocks my messages - What can I do?

administradorb

New Pleskian
Every time my server tries to send mail to Gmails/yahoos - they reject it with the following message:

Code:
Apr 13 11:35:49 m1370 plesk sendmail[5009]: handlers_stderr: PASS
Apr 13 11:35:49 m1370 plesk sendmail[5009]: PASS during call 'limit-out' handler
Apr 13 11:35:49 m1370 plesk sendmail[5009]: handlers_stderr: SKIP
Apr 13 11:35:49 m1370 plesk sendmail[5009]: SKIP during call 'check-quota' handl  er
Apr 13 11:35:49 m1370 postfix/pickup[1759]: C90FA61668: uid=48 from=<apache>
Apr 13 11:35:49 m1370 postfix/cleanup[4996]: C90FA61668: message-id=<20150413143  [email protected]>
Apr 13 11:35:49 m1370 postfix/qmgr[1760]: C90FA61668: from=<[email protected]  >, size=683, nrcpt=1 (queue active)
Apr 13 11:35:50 m1370 postfix/smtp[4998]: certificate verification failed for gm  ail-smtp-in.l.google.com[2a00:1450:4013:c00::1a]:25: untrusted issuer /C=US/O=Eq  uifax/OU=Equifax Secure Certificate Authority
Apr 13 11:35:50 m1370 postfix/smtp[4998]: C90FA61668: to=<[email protected]>, relay=gmail-smtp-in.l.google.com[2a00:1450:4013:c00::1a]:25, delay=0.3  5, delays=0/0/0.24/0.11, dsn=5.7.1, status=bounced (host gmail-smtp-in.l.google.  com[2a00:1450:4013:c00::1a] said: 550-5.7.1 [2a02:c200:0:10::1370:1  12] Our  system has detected that this 550-5.7.1 message is likely unsolicited mail. To  reduce the amount of spam sent 550-5.7.1 to Gmail, this message has been blocked  . Please visit 550-5.7.1 http://support.google.com/mail/bin/answer.py?hl=en&answ  er=188131 for 550 5.7.1 more information. u6si19217499wja.137 - gsmtp (in reply  to end of DATA command))
Apr 13 11:35:50 m1370 postfix/cleanup[4996]: 2A68161669: message-id=<20150413143  [email protected]>
Apr 13 11:35:50 m1370 postfix/bounce[4999]: C90FA61668: sender non-delivery noti  fication: 2A68161669
Apr 13 11:35:50 m1370 postfix/qmgr[1760]: 2A68161669: from=<>, size=3262, nrcpt=  1 (queue active)
Apr 13 11:35:50 m1370 postfix/qmgr[1760]: C90FA61668: removed
Apr 13 11:35:50 m1370 postfix/error[5016]: 2A68161669: to=<[email protected]>  , relay=none, delay=0.01, delays=0/0.01/0/0, dsn=5.0.0, status=bounced (User unk  nown in virtual alias table)
Apr 13 11:35:50 m1370 postfix/qmgr[1760]: 2A68161669: removed

I tried Qmail, same issue

Code:
Hi. This is the qmail-send program at m1370.contabo.
I'm afraid I wasn't able to deliver your message to the following addresses.
This is a permanent error; I've given up. Sorry it didn't work out.

<[email protected]>:
2a00:1450:4013:0c00:0000:0000:0000:001b failed after I sent the message.
Remote host said: 550-5.7.1 [2a02:c200:0:10::1370:1      12] Our system has detected that this
550-5.7.1 message is likely unsolicited mail. To reduce the amount of spam sent
550-5.7.1 to Gmail, this message has been blocked. Please visit
550-5.7.1 http://support.google.com/mail/bin/answer.py?hl=en&answer=188131 for
550 5.7.1 more information. xb4si18948018wjc.178 - gsmtp[code]

pS: Centos 6.6 + Plesk 12 Web Pro Edition

My server certainly did not spam Gmail servers, (my old server works fine sending email t gmail) I fear this has something to do with my "Postfix" configuration. Thanks for help!
 
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