Hello All,

I'm having an issue with Comcast. Can someone tell me how to narrow down what is going on and how to resolve it? (I replaced the valid e-mail address with X's, and the real domain with "mydomain.com". Thanks in Advance! - Sam


linode768-sr [3] sr> telnet mx2.comcast.net 25
Trying 2001:558:fe21:2a::6...
Connected to mx2.comcast.net.
Escape character is '^]'.
421 resimta-ch2-03v.sys.comcast.net comcast Too many sessions opened


# mailq
/var/spool/mqueue (2 requests)
-----Q-ID----- --Size-- -----Q-Time----- ------------Sender/Recipient-----------
t3RERYSN020985 2271 Mon Apr 27 09:27 <apache@mydomain.com>
(Deferred: 421 resimta-ch2-10v.sys.comcast.net comcast Too ma)
<XXXXXX@comcast.net>

t3RF6GPm002155 2495 Mon Apr 27 10:06 <apache@mydomain.com>
(Deferred)
<XXXXX@comcast.net>
Total requests: 2

Since you're connecting via IPv6, maybe you're running into this problem?

Thanks, I think this is separate. In the past I was getting the error "..found on one or more DNSBLs, see http://postmaster.comcast.net/smtp-erro ... p#BL000001"

But then I changed sendmail to use IPV4 address, and now getting the "Too many sessions opened" error message.

You might want to look at destination_concurrency settings: see http://www.porcupine.org/postfix/doc/ra ... estination