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0003051ClearOSapp-smtp - SMTP Serverpublic2015-06-05 08:262015-07-07 19:36
user2 
user2 
normalmajorsometimes
closedfixed 
 
6.6.0 Updates 
0003051: Mail delivery attempts to use IPv6 and fails
Postfix attempts to deliver mail to IPv6 addresses on systems with just IPv4 networks. Here is a sampling in the /var/log/maillog file:

Jun 5 10:15:31 dc postfix/smtp[11296]: connect to ASPMX.L.GOOGLE.COM[2607:f8b0:400d:c06::1a]:25: Network is unreachable

Solution: set inet_protocols in /etc/postfix/main.cf to ipv4
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Issue History
2015-06-05 08:26user2New Issue
2015-06-05 08:26user2Assigned To => user2
2015-06-05 08:26user2Statusnew => confirmed
2015-06-05 08:27user2Note Added: 0001631
2015-06-05 08:28user2Issue cloned: 0003061
2015-06-11 15:48user2Statusconfirmed => resolved
2015-06-11 15:48user2Resolutionopen => fixed
2015-07-07 19:36user2Statusresolved => closed

Notes
(0001631)
user2   
2015-06-05 08:27   
Hypothesis: this happened on a system using Google's DNS servers, so the issue might only appear on such systems.