On 12/19/2012 6:59 PM, Joseph Tam wrote:
Rajesh M writes:
i am planning to migrate from qmail pop3 to dovecot pop3
the number of users on the server is large over 5000 ... also data volume is large - over 3.5 tb -- ie many users several 1000s of emails in their inbox
If you stay on the list, you might find some people here whose mail metrics are several orders of magnitude larger than this.
- will the migration cause all the emails on the server to re-download ...
- has anybody migrated from qmail pop3 to dovecot pop3 successfully without emails being downloaded again
A proper migration will avoid this. Google is your friend
http://lmgtfy.com/q=POP+qmail+to+dovecot+migrationThe top hits provide exactly what you're looking for.
- can dovecot be configured to allow only one download at a time - pop3 locking with time out setting that can be customized
We migrated 5000+ from qpopper years ago. Dovecot is sooo much better on system load. Yes, locking and timeouts are in the config file.
- can dovecot pop3 be configured so that it will allow download of emails only of the last say 15 days ie even if the same pop3 user is configure on another machine it will download only messages of the last 15 days
That's not part of pop3, so no, it's not possible with dovecot alone. You could probably work out a plugin to move read mail after x days, or there may be one out there ? Or some imap robot could do it.. Ken A. Pacific.Net
I can't answer this, but if this is an attempt to prevent mass download, the answer to 1+4 makes these questions irrelevant.
Joseph Tam jtam.home@gmail.com
-- Ken Anderson Pacific Internet - http://www.pacific.net Latest Pacific.Net Status - http://twitter.com/pacnetstatus
thanks joseph and ken for your replies
ken, if possible can you please give me some more information concerning the servers that you use.
i am using qmailtoaster my server has over 3 tb of data.
Q1) which email server software are you using for your 5000+ users
Q2) what is your server hardware configuration for handling 5000+ users
Q3) do you users store several 1000's of emails in their inboxes.
Q4) i want to try out by running dovecot pop3 on a separate port other than 110 while qmail toaster pop3 continues to run on port 110 and try downloading from specific a test mailbox. do you forsee any problems in this ?
thank you once again for your kind help.
rajesh