Migrating to FreeBSD from Debian

[Michael B. Eichorn]

On Tue, 2015-12-08 at 22:00 +0100, Dr. Nikolaus Klepp wrote:
> Am Dienstag, 8. Dezember 2015 schrieb Dutch Ingraham:
> > > I'm looking for a maildir capable GUI mailclient for FreeBSD. My
> > transition from Debian to FreeBSD is stuck in the middle for a year
> > as I
> > still have to use Devuan+TDE for my office work, not at least
> > because of
> > kmail. I know, KDE comes with a kind of kmail, but that does not
> > fit the
> > bill (akonadi + nepomik ... *shudder*).
> > > 
> > > Nik
> > 
> > Doesn't Thunderbird fit the bill? [1]
> > 
> > [1]https://en.wikipedia.org/wiki/Maildir
> > 
> 
> 
> Sorry to say, no. Thundebirds maildir relies on index files. If e.g.
> fetchmail + procmail place mails in Mail/inbox/cur, these mails will
> not show up in Thunderbird till the index is rebuilt.
> 
> Nik
> 
> 

Procmail is no longer being maintained (The last release was 2001-09).
As it is causing you problems, I would recommend trying to swap it out.
There are other MDAs availble (maildrop, dovecot, ...) that might work
better with a modern gui.