[Dovecot] Dovecot and Seamonkey/Mozilla "delete attachment"

[Bryce Nesbitt]

I'm having persistent trouble deleting larger attachments from messages
in Mozilla/Seamonkey mail, and I'm thinking it may be related to
Dovecot.  A bug report is over at
https://bugzilla.mozilla.org/show_bug.cgi?id=381759

I do not have the version number of Dovecot available, unless you know
how to get it from the IMAP prompt:

> telnet idiom.com 143
Trying 216.240.32.1...
Connected to idiom.com.
Escape character is '^]'.
* OK Dovecot ready.

How can I track this down more?  Is anyone using Seamonkey and this
particular new feature (delete the attachment, but keep the message body
intact)?