Ubuntu
sendmail package

  1. Bug #1223633
  2. Comment #0

Comment 0 for bug 1223633

Revision history for this message
Kees Cook (kees) wrote :

When sendmail is configured with both IPv4 and IPv6 interfaces, it can fail to deliver to any hosts that have a CNAME as an MX record that resolves only to an A record with no AAAA record.

An existing example of this is here:
http://serverfault.com/questions/482035/sendmail-issue-with-ipv6