Mailing List CGatePro@mail.stalker.com Message #105688
From: Bill Cole <cgp-2015@billmail.scconsult.com>
Subject: Re: "Too many hops"?
Date: Thu, 11 Jun 2015 09:57:32 -0400
To: CommuniGate Pro Discussions <CGatePro@mail.stalker.com>
X-Mailer: MailMate (1.9.1r5090)
On 10 Jun 2015, at 12:47, James Moe wrote:

cgpro 5.4.11
linux 3.16.7-21-desktop x86_64

Mailchannel.net appears to have arisen as a popular email delivery
service.

I think you probably mean mailchannelS.net, which is about a decade old and is what people use who need something like SendGrid but much better...

It is also somewhat broken. For no obvious reason it bounces
the message back and forth between the itself and the originating
sender at least 10 times before actually sending the message on to its
recipient.

Not quite. The "no obvious reason" hinges on the word "obvious" and I'm not sure whether it's handled as a trade secret or patented so I won't attempt to explain what i think I know about it based on an informal explanation by Ken Simpson many years ago... Suffice it to say that there IS a method to the apparent madness. Mailchannels.net is a very clean sender from a 'spam' perspective, but they have a history of catching corner cases on other people's inbound anti-spam practices.

Also worth noting: if MailChannels mail to you routinely has a very large number of Received headers, it may indicate a chronic problem with your connectivity or receiving capacity. The occasional apparent 25-hop incident isn't a concern but if everything they offer is like that, you may have a problem.

The result is a huge header with a larger number of "Received: ..."
and "X-whatever" header entries. CGPro has been rejecting some of
these messages because of the large number of Received entries.

Where is the setting that sets the limit for this?

08:49:34.613 1 QUEUE([5736063]) Enqueueing failed. Error Code=mail
loop: too many hops (too many 'Received:' header fields)

As Lewis noted: Settings->Mail->Queue in the Message Enqueuer section, and the default limit of 20 is somewhere near the worst possible setting: too high to cut off many real loops usefully or kill the spam that uses many Received headers to obfuscate real origins, but low enough that MailChannels and maybe one or two other legitimate large sending rigs can hit it.

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