2016-10-14 05:18:35 socket bind() to port 25 for address 127.0.0.1 failed: Address already in use: daemon abandoned
2016-10-14 05:19:44 1buuuG-0006WT-99 <= root@debian U=root P=local S=404
2016-10-14 05:19:45 1buuuG-0006WT-99 ** gsaggi@gmail.com R=dnslookup T=remote_smtp X=TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128 DN="C=US,ST=California,L=Mountain View,O=Google Inc,CN=mx.google.com": SMTP error from remote mail server after end of data: host gmail-smtp-in.l.google.com [2404:6800:4003:c00::1a]: 550-5.7.1 [2400:8901::f03c:91ff:fea1:d24d] Our system has detected that this\n550-5.7.1 message does not meet IPv6 sending guidelines regarding PTR records\n550-5.7.1 and authentication. Please review\n550-5.7.1  https://support.google.com/mail/?p=IPv6AuthError for more information\n550 5.7.1 . uj9si14332493pac.74 - gsmtp
2016-10-14 05:19:45 1buuuH-0006WY-Up <= <> R=1buuuG-0006WT-99 U=Debian-exim P=local S=1629
2016-10-14 05:19:45 1buuuG-0006WT-99 Completed
2016-10-14 05:19:45 1buuuH-0006WY-Up ** linode@debian <root@debian>: Unrouteable address
2016-10-14 05:19:45 1buuuH-0006WY-Up Frozen (delivery error message)