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[Imap-protocol] Are clients pinging servers at the same time?

E-mail headers
From: Tim Showalter <tjs@psaux.com>
To: imap-protocol@u.washington.edu
Date: Fri, 08 Jun 2018 12:34:46 -0000
Message-ID: 4E4080F7.4060005@psaux.com permalink / raw / eml / mbox 
We've been doing some tuning on our IMAP servers, and I'm noticing 
spikes on the hour and quarter-hours.  I haven't dug into the data too 
much, but what I'm seeing suggests client requests hitting us at :00, 
:15, :30, and :45, every hour.

Are there clients out there that are timing polls, updates, whatever, to 
be on the quarter-hours?  It seems to be worse on the hour, but we get 
little echos on the 15s.

Every 15 minutes would be fine, just not so many at the same time.

I'm looking for both clients that have this behavior, and longer-term, a 
fix.  This is sub-optimal behavior from a user perspective, as the 
clients would get better service if they randomized and hit us at 
different times.

Speaking only for myself,
Tim
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E-mail headers
From: lyndon@orthanc.ca
To: imap-protocol@localhost
Date: Fri, 08 Jun 2018 12:34:46 -0000
Message-ID: 2615d8a5461062fd95f3683dea44ff7b@orthanc.ca permalink / raw / eml / mbox 
> We've been doing some tuning on our IMAP servers, and I'm noticing 
> spikes on the hour and quarter-hours.  I haven't dug into the data too 
> much, but what I'm seeing suggests client requests hitting us at :00, 
> :15, :30, and :45, every hour.

I expect this is cron running fetchmail.
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