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Old 07-16-2001, 01:30 PM   #1
Andrea
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Registered: Jul 2001
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How To throttle Pop3??


I'm using postfix on my linux (mandrake) box and some of my users have their email clients set to check their mail every single minute. Sometimes this messes up:


Jul 15 21:26:16 darius ipop3d[13912]: pop3 service init from 24.160.150.223
Jul 15 21:26:17 darius ipop3d[13912]: Trying to get mailbox lock from process 13694
Jul 15 21:26:31 darius ipop3d[13912]: Mailbox is open by another process, access is readonly
Jul 15 21:26:31 darius ipop3d[13912]: Error opening or locking INBOX user=ginny host=cs160150-223.satx.rr.com [24.160.150.223]
Jul 15 21:26:31 darius ipop3d[13912]: Login user=ginny host=cs160150-223.satx.rr.com [24.160.150.223] no mailbox
Jul 15 21:26:31 darius ipop3d[13912]: Expunge ignored on readonly mailbox
Jul 15 21:26:31 darius ipop3d[13912]: Logout user=ginny host=cs160150-223.satx.rr.com [24.160.150.223] nmsgs=1 ndele=0


I caught it in the act for the above example and process 13694 was indeed an ipop3 process. So I was wondering if there was a way for me to limit how often a user can check his/her email via pop. Something like no more frequently than every 10 minutes. Is this possible?

Thanks for any advice.
 
Old 07-16-2001, 02:48 PM   #2
isajera
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my only advice here is to send them an e-mail and ask them politely (either that or send them and e-mail and threaten them)

actually, i wanted to ask... do you work for an isp? i've been looking for a new, preferably linux-friendly one.

Last edited by isajera; 07-16-2001 at 03:07 PM.
 
Old 07-16-2001, 04:07 PM   #3
Andrea
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Nope, don't work for an ISP. Just have a home network. I use Road Runner and SuperUser Networks for my ISPs.
 
Old 07-21-2001, 01:44 PM   #4
Andrea
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In the spec for POP (rfc2449) there is an extension called LOGIN-DELAY that does exactly what I want:

POP3 clients often login frequently to check for new mail.
Unfortunately, the process of creating a connection,
authenticating the user, and opening the user's maildrop can be
very resource intensive on the server. A number of deployed POP3
servers try to reduce server load by requiring a delay between
logins. The LOGIN-DELAY capability includes an integer argument
which indicates the number of seconds after an "+OK" response to
a PASS, APOP, or AUTH command before another authentication will
be accepted. Clients which permit the user to configure a mail
check interval SHOULD use this capability to determine the
minimum permissible interval. Servers which advertise LOGIN-
DELAY SHOULD enforce it.

However, I haven't found a linux pop server yet that supports (enforces) this.
 
  


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