Hello,
I send our an email from my server to all of my user. I found out that hotmail user can receive my email while gmail user not able to receive my email.
Here is the /var/log/mailog
Feb 21 08:06:44 sd-55991 postfix/pickup[19620]: 820272AA057F: uid=502 from=theprocpm@gmail.com
Feb 21 08:06:44 sd-55991 postfix/cleanup[20956]: 820272AA057F: message-id=20140221070644.820272AA057F@sd-55991.localdomain
Feb 21 08:06:44 sd-55991 postfix/qmgr[19621]: 820272AA057F: from=theprocpm@gmail.com, size=1529, nrcpt=1 (queue active)
Feb 21 08:06:44 sd-55991 postfix/smtp[20958]: connect to gmail-smtp-in.l.google.com[2a00:1450:400c:c00::1b]:25: No route to host
Feb 21 08:06:44 sd-55991 postfix/smtp[20958]: 820272AA057F: to=lickpute@gmail.com, relay=gmail-smtp-in.l.google.com[173.194.78.26]:25, delay=0.74, delays=0.52/0/0.05/0.17, dsn=5.7.1, status=bounced (host gmail-smtp-in.l.google.com[173.194.78.26] said: 550-5.7.1 [62.210.180.206 7] Our system has detected that this message is 550-5.7.1 likely unsolicited mail. To reduce the amount of spam sent to Gmail, 550-5.7.1 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. ja9si1913238wic.46 - gsmtp (in reply to end of DATA command))
Feb 21 08:06:44 sd-55991 postfix/cleanup[20956]: D82832AA0587: message-id=20140221070644.D82832AA0587@sd-55991.localdomain
Feb 21 08:06:44 sd-55991 postfix/bounce[20959]: 820272AA057F: sender non-delivery notification: D82832AA0587
Feb 21 08:06:44 sd-55991 postfix/qmgr[19621]: D82832AA0587: from=<>, size=4137, nrcpt=1 (queue active)
Feb 21 08:06:44 sd-55991 postfix/qmgr[19621]: 820272AA057F: removed
Feb 21 08:06:44 sd-55991 postfix/smtp[20958]: connect to gmail-smtp-in.l.google.com[2a00:1450:400c:c00::1b]:25: No route to host
Feb 21 08:06:46 sd-55991 postfix/smtp[20958]: D82832AA0587: to=theprocpm@gmail.com, relay=gmail-smtp-in.l.google.com[173.194.78.26]:25, delay=1.5, delays=0.04/0/0.04/1.5, dsn=5.7.1, status=bounced (host gmail-smtp-in.l.google.com[173.194.78.26] said: 550-5.7.1 [62.210.180.206 7] Our system has detected that this message is 550-5.7.1 likely unsolicited mail. To reduce the amount of spam sent to Gmail, 550-5.7.1 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. ga2si1895317wic.72 - gsmtp (in reply to end of DATA command))
Feb 21 08:06:46 sd-55991 postfix/qmgr[19621]: D82832AA0587: removed