Cyrus IMAP server

Jeroen van Meeuwen (Kolab Systems) vanmeeuwen at
Thu Oct 21 13:47:54 EDT 2010

Dan White wrote:
> On 21/10/10 16:43 +0200, JC Putter wrote:
> >we are running cyrus-imapd 2.3 on centos 5.5
> >
> >we are getting complains from users getting error messages saying Mailbox
> >locked by POP Server, i understand that pop3 server can handle only 1
> >concurrent connection, can cyrus be configured to support more connection?
> We're getting a lot more of these complaints as well as our ISP customers
> start configuring email access on their phones and handhelds.
> The solution for us has been to encourage customers to reconfigure both
> devices (PC and phone) to use IMAP.
> The POP3 standard (RFC 1939) requires each connection to obtain an
> exclusive lock on a maildrop before continuing operations. It lacks the
> proper semantics to handle simultaneous access to a mailbox.

Hi there,

I went ahead and put this protocol limitation in my work-in-progress 
Deployment Guide document ;-)

Kind regards,

Jeroen van Meeuwen
Senior Engineer, Kolab Systems AG

e: vanmeeuwen at
t: +316 42 801 403

pgp: 9342 BF08

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