Berkeley CSUA MOTD:Entry 36030
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2025/05/24 [General] UID:1000 Activity:popular
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2005/2/2-3 [Computer/HW, Computer/HW/Drives] UID:36030 Activity:low
2/2     What are the differences and pros/cons of POP3 vs. IMAP?  I'm asking
        both on the admin side and for the end-user.
        \_ Hm the nuker strikes again.  IMAP is good because it lets you see
           mails from several clients (including via CLI and web mail.)  If
           you're going to do imap, I recommend Dovecot/imaps + Postfix with
           TLS and SMTP AUTH.  I also run an openwebmail server over SSL, the
           whole combo works a charm.  -John
        \_ The most irritating aspect of POP3 is when you are migrating
           someone to another computer, and their new workstation downloads
           5,000 duplicate e-mails that weren't deleted from the mail server
           yet -- and each duplicate e-mail is re-filtered into separate
           folders in their e-mail client.
        \_ IMAP uses more disk space on the server, and pop is a pain for
           the end-user-side if they have more than one computer. POP
           is good if the user has one computer. overall IMAP is nice.
           \_ How much more?  One file per message vs. one file per user, or
              multiple copies of each message?  Are we talking 5% or 200%?
              \_ The number of messages per file varies depending on the
                 implementation, but with IMAP, mail stays on the server,
                 so that is a whole lot more disk space if you user keeps
                 a lot of mail, and the storage grows over time. I don't
                 think any sane email system would keep "multiple copies
                 of each message".
                 http://www.google.com/search?q=pop+versus+imap
                 \_ Disk size doubles every 12 (or is it 18 month).  Not using
                    IMAP because (shock and horror) users will store mail on
                    the server (kind of the point, now isn't it) is a) insane
                    and b) means you need don't understand exponentials and
                    should probably get out of this computery business...
        \_ IMAP is great if you have mail clients that do reasonable caching
           of messages after downloading them.  It also allows you to run
           a concurrent webmail service without problems.  I recommend trying
           dovecot imaps.  -John
        \_ The really sad thing is that IMAP as a protocol is a superset of
           POP3.  You can make IMAP act just like POP3 if you want.  In
           practice, people seem to write IMAP clients to tend to leave mail
           on the server and POP3 to tend to download it all every time.
           \_ POP3 is fucking deprecated.  Don't use it anymore.  The main
              (only?) benefit of POP3 is that it allows lazy fucking admins to
              do less set up and (short term) maintenance.  The main problem
              with IMAP is that because lazy fucking admins kept using POP3
              the immature, poor IMAP servers and clients haven't died the
              painful death at the hands of the market they deserve.  If
              you're going to run an open-source IMAP server, run Cyrus.
              Courier and UW-IMAP both suck hard if you throw a large number
              of users or a handful of users with large mailboxes at them.  If
              you want a good tool to extract messages from the clutches of
              your existing mailserver and transfer them via imap commands to
              your shiny new mailserver, dig up the uw-mailutils utility(ies?)
              which are part of the UW-IMAP package or available alone in
              debian (apt-get install uw-mailutils).
ERROR, url_link recursive (eces.Colorado.EDU/secure/mindterm2) 2025/05/24 [General] UID:1000 Activity:popular
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www.google.com/search?q=pop+versus+imap
Page 4 POP Versus IMAP M ail clients like Eudora communicate with a mail host via one of two protocols: POP and IMA P ... E-Mail Protocols --> POP versus IMAP Generally, there are three ways to handle incoming e-mail: IMAP, POP or Webmail. POP versus IMAP - OIT Help Desk POP versus IMAP Generally, there are three ways to handle incoming e-ma il: IMAP, POP or Webmail. POP versus IMAP - Sentex Data Communications POP versus IMAP Internet Message Access Protocol (IMAP). Advantages: Kee ps messages individually on the Sentex server. Nevis POP versus IMAP guide Nevis POP versus IMAP guide, A brief guide to the difference between usin g POP versus IMAP to read your mail. Generally, you want to use POP if you access your mail from one computer, and IMAP if you need to manipulate your mail from many computers.