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comcast Too many sessions opened
https://forum.linode.com/viewtopic.php?f=11&t=11780
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Author:  srose99 [ Mon Apr 27, 2015 12:54 pm ]
Post subject:  comcast Too many sessions opened

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

Author:  Vance [ Tue Apr 28, 2015 2:15 am ]
Post subject:  Re: comcast Too many sessions opened

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

Author:  srose99 [ Tue Apr 28, 2015 3:25 am ]
Post subject:  Re: comcast Too many sessions opened

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.

Author:  hjohnson57 [ Wed May 27, 2015 3:18 pm ]
Post subject:  Re: comcast Too many sessions opened

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

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