For the last month or so, the mailing lists have taken quite some time to forward emails. An email sent to a list takes several hours before being sent to it's subscribers. It seems to hang up, although the headers say otherwise. The emails sent date and time seem to match the day and time of when it was supposed to be sent, but the received time is usually hours, sometimes days, after it being sent apparently. I have checked my email client, and it doesn't seem to be the issue as all the other emails are received almost instantaneously.
My email client logs the date and time it's send, supposedly, and the date and time it was received. (EST)
Here are some examples of emails from mailing lists:
[Accounts-enwiki-l] TS ACC statistics, 2013-12-30 Sent: Mon 12/30/2013 7:00 PM Received: 1/4/2014 9:09 PM (5 days)
Re: [Accounts-enwiki-l] Fwd: Undelivered Mail Returned to Sender Sent: Sat 1/4/2014 11:02 AM Received: 1/4/2014 11:04 PM (12 hours)
Re: [Accounts-enwiki-l] [ACC #------] English Wikipedia Account Request Sent: Wed 1/1/2014 5:45 PM Received: 1/5/2014 12:09 AM (Almost 4 days)
Re: [Accounts-enwiki-l] [ACC #114635] English Wikipedia Account Request Sent: Mon 1/6/2014 8:26 AM Received: Mon 1/6/2014 12:59 PM (4.5 hours)
Here are some examples of non-list emails from various people:
Re: [waca] Splash page or screen (#22) Sent: Sat 1/4/2014 7:48 PM Received: Sat 1/4/2014 7:48 PM (no delay)
Re: [waca] Redirection script (#49) Sent: Sun 1/5/2014 6:17 PM Received: Sun 1/5/2014 6:17 PM (no delay)
Σ left you a message on Wikipedia Sent: Mon 1/6/2014 5:14 AM Received: Mon 1/6/2014 5:14 AM (no delay)
Hahc21 left you a message on Wikipedia Sent: Tue 12/24/2013 4:02 PM Received: Tue 12/24/2013 4:02 PM (no delay)
Random companies and users:
Fwd: Accounts-enwiki-l post from [redacted email] requires approval Sent from a wikipedia user's email at: Mon 1/6/2014 12:06 PM Received: Mon 1/6/2014 12:06 PM (no delay)
You are now an accounts-enwiki-l listmod! Sent: Mon 1/6/2014 3:28 AM Received: Mon 1/6/2014 3:28 AM From: a wikipedia user's email (no delay)
The list seems to hangup during sending at some point making it really hard to follow discussions properly. Note that I have redacted a few things from the subject headers for privacy.