I'm finding someone to check into this for you and will let you know what I find out.
Thanks, John On Tue, Nov 1, 2016 at 7:50 AM, Shane Kerr <[email protected]> wrote: > I have been running my own e-mail server for many years now, and have > been native IPv6 for... maybe 5 or 6 years? > > I never have any problems, except for delivering to Comcast users. I > get bounces like this: > > A message that you sent could not be delivered to one or more of its > recipients. This is a permanent error. The following address(es) failed: > > [email protected] > SMTP error from remote mail server after initial connection: > host mx2.comcast.net [2001:558:fe21:2a::6]: 554 > resimta-ch2-08v.sys.comcast.net comcast ESMTP server not available > [email protected] > SMTP error from remote mail server after initial connection: > host mx2.comcast.net [2001:558:fe21:2a::6]: 554 > resimta-ch2-08v.sys.comcast.net comcast ESMTP server not available >
