William Agbor Baiyee writes:
> I have recently received messages from a few subscribers of a list
> that I manage. I would appreciate any advice regarding how best
> to proceed with this issue.
1. If they are reporting non-delivery of messages they sent, *and*
they use Gmail, *and* other subscribers and/or the archives are
receiving the posts, this is a Gmail issue. Gmail discards all
incoming messages that have the same message ID as a message in
the Sent folder. They will reappear as part of the conversation
if somebody replies to them. Nothing can be done about this.
2. Check the membership list. Each member has a property called "no
mail", which if set causes Mailman to ignore them when sending
messages. This can be set by the members themselves (useful if
they go on vacation or want to use the address for posting but not
receiving), or it can be automatically set in the event of several
delivery failures. Definitely do this first because it's easy.
If no-mail is indeed set, turn it back off. (Don't forget to
click the "submit all changes" button!) If it soon gets turned
back on again, there are problems at their site. They need to
consult with their postmaster.
3. If in step 2 you couldn't find the member, then they subscribed
using a different address from the one they used to report. You
need to find out what their subscribed address is. They should
look at a post received in "whole message" mode or "show all
headers" mode or something like that. There's no easy way for you
to check (addresses are alphabetized by mailbox; you'll have to
read the whole list if you're looking for their display names).
4. Check your MTA logs for delivery to those members. You can search
for their addresses. If you know which messages they are
reporting as missing, you can look for specific timestamps. Find
out if those messages were delivered to them (a 250 or OK status
in the log). If so, it's not your problem; both Mailman and your
MTA are functioning properly. If you found them in step 2 but not
in this step, that's weird. Come back and report details.
If you find records of the message being sent but delivery failed,
that's a problem on their end. You should probably ask them to
talk to their postmaster about it.
5. Ask the members to check their spam folders. If the missing posts
are in there, they need to whitelist your list.
6. If none of the above reveal a reason why they're not getting the
mail, perhaps your site has been blacklisted. The big services
like Gmail and Yahoo all have ways to find out if you've been
blacklisted, and you should also check the third party "black
hole" services.
That should be enough to keep you busy for a while. :-)
Steve
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