[Mailman-Users] Unexplained unsubscribes of yahoo.com email addresses

Brian Carpenter brian at emwd.com
Mon Mar 1 18:08:33 CET 2010

> Brian Carpenter wrote:
> >
> >We have a server where this problem is happening and in the case of
> this
> >particular server (being solely used by a single non-profit
> organization)
> >Yahoo is being VERY persistent in delaying their messages and they are
> >seeing Yahoo.com addresses being unsubsribed. We are in the process of
> >working with Yahoo in trying to get this server whitelisted with them.
> Very persistent as in delaying for more than 5 days, or is your MTA's
> retry period shorter than that?
> I'm sure you know what's happening in your case; maybe I'm just lucky,
> but I think my Yahoo deferrals/retries always succeed within way less
> than 24 hours.
> <rant>
> I think Yahoo is wrong in this. If the deferrals are a form of
> greylisting, there's no point in deferring more than once. One delayed
> retry proves the sending MTA is going to retry and subsequent
> deferrals are pointless. On the other hand, if they're never going to
> accept the mail, they should reject it outright with a 5xx. The only
> result from deferring multiple times and then accepting is to cause
> problems for their users resulting from delayed mail and to waste
> network resources with all the unnecessary retries.
> </rant>
> --
> Mark Sapiro <mark at msapiro.net>        The highway is for gamblers,
> San Francisco Bay Area, California    better use your sense - B. Dylan

For cPanel servers the default is 4 days which is what we use. For this
particular client, they have over a hundred active discussion mailing lists.
They are small lists in regards to members but they are active and the mail
queue just keeps filling up due to Yahoo! terrible deferral policies.

Totally agree with your rant. Right on target.

Brian Carpenter

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