I added a new mailman list with 4 subscribers. One of the subscribers was the same earthlink address as the 600+ subscriber email list.

When a messages was sent to both lists - the earthlink subscriber ONLY received the message from the 4 subscriber list.

Seems Mailman is cablable of getting the message out at least on a small list. Any idea what the threshold is?

Any other tests that can be done to futher isolate this pesky issue?

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Brad Knowles wrote:

At 10:20 AM -0800 2004-12-14, Easy wrote:

 - NOT ALL subscribers of any of the ISPs are being rejected. Many
 subscribers on ALL the ISPs are receiving the daily email just fine.


Many ISPs will apply different anti-spam processing rules for different recipients. Many recipients will not be aware of any anti-spam processing rules that are being used by the system on their behalf, or how their actions can modify those rules.

- Some 250 of the subscribers are now on a Topica listserv. They ALL
receive the daily email each day. When the same message is sent to the
mailman listserv some of these 250 subscribers do NOT receive the email.


This is an indicator that at least part of the problem may somehow lie within Mailman, but since you're using cPanel, it's going to be very difficult to determine where the fault may lie.

Of course, if the Topica mailing list is not hosted on the same physical and virtual machine as the Mailman mailing lists, then there is always the chance that anti-spam rules will be host-specific and not applied the same between the two systems.

 - Emails sent directly to the subscribers, from the same email address
 that is used to send to the mailman listserv get through just fine,
 though email sent through mailman does not get to them.


Again, these messages are not coming through the same system, and the same anti-spam rules may not be applied by the recipient machines.

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