Hi all

I'm considering moving over my POP3 service from qmail-pop3d to Dovecot for the following reasons:

• Support for Maildir++ which I have yet to implement
• Already using Dovecot for IMAP, so makes sense i.t.o Maildir++
• Support for SQL based user authentication

My primary concerns are performance and security.

Before I go down that route of migrating away from qmail-pop3d, I'd appreciate some answers and feedback on the following.

There is mention of the Maildir filename extension W= for virtual file size here:

http://wiki.dovecot.org/POP3Server

However, I can't find any MDAs which support writing the filename in this format. Maildrop seems to support S= only?

If Dovecot is only able to read W= in the filename, I would imagine that it might make sense to have an MDA like Maildrop write the message to disk, replacing all LF with CR+LF and finally write the filename with identical S= and W= filename extensions included?

Example:

Maildrop replaces all LFs with CR+LF in incoming message.

Maildrop writes message as: 1035478339.27041_118.foo.org,S=1000,W=1000 (where 1000 is the file's RFC822.SIZE)

Then Dovecot doesn't have to calculate virtual message sizes.

I've also found this thread: http://markmail.org/message/oznf2f7m7hvsxqn6

... which suggests changing mail_get_virtual_size to mail_get_physical_size in src/pop3/client.c

Would this read the size from S=, or do a stat()?

5. Does anyone use Dovecot pop3 service on thousands of mailboxes and if so, what specific tweaks / setup do you use?

Thanks Dale