Setup changes 1.x to 2.x -- custom POP3 account handling required.

22 Feb 2016

      Hi,
Previously I did /special/ processing for some email accounts; if a
particular file existed in the user's home directory, then I caused the
account to use /var/mail/$USER file for POP -- otherwise it used IMAP.
Now, because I adjusted the setup for POP only, IMAP still worked
perfectly well.  Some users have both POP and IMAP access for various
reasons.
The special POP processing was done using a shell script [1] in place of:
/usr/lib/dovecot/pop3

which in turn called the normal binary once setting up the
environment.

Now, I have been forced to upgrade my Debian from squeeze-lts to wheezy
and the dovecot setup is quite different.
How can I implement my /wrapper/ script for POP handling now?
Here is my current setup with dovecot -n ...
# 2.1.7: /etc/dovecot/dovecot.conf
# OS: Linux 2.6.32-5-xen-amd64 x86_64 Debian 7.9
mail_location = maildir:~/Maildir
namespace inbox {
inbox = yes
location =
mailbox Drafts {
special_use = \Drafts
}
mailbox Junk {
special_use = \Junk
}
mailbox Sent {
special_use = \Sent
}
mailbox "Sent Items" {
special_use = \Sent
}
mailbox "Sent Messages" {
special_use = \Sent
}
mailbox Trash {
special_use = \Trash
}
prefix =
}
passdb {
driver = pam
}
plugin {
sieve = ~/.dovecot.sieve
sieve_dir = ~/sieve
}
protocols = " imap pop3"
service imap-login {
inet_listener imap {
port = 0
}
}
service pop3-login {
inet_listener pop3 {
port = 0
}
}
ssl = required
ssl_cert = 
[1] This is the content of the original wrapper script:
#!/bin/sh
if [ -f $HOME/.use-mbox-for-pop3s ]; then
export MAIL=mbox:$HOME/mail:INBOX=/var/mail/$USER
export USER_INBOX=/var/mail/$USER
if [ -f $USER_INBOX ]
then
export USER_INBOX_GROUP=$(stat -c %G $USER_INBOX)
if [ $USER_INBOX_GROUP != $USER ]
then
(
date
ls -l $USER_INBOX
chown Debian-exim:$USER $USER_INBOX
ls -l $USER_INBOX
) >> /var/log/usr-lib-dovecot--pop3-affinity.log
fi
fi
else
if [ -d $HOME/Maildir ]; then
export MAIL=Maildir:$HOME/Maildir
else
export MAIL=mbox:$HOME/mail:INBOX=/var/mail/$USER
fi
fi
# Finally execute the imap/pop3. If you use both, you'll need two scripts.
# - this customization just for POP3S ...
exec /usr/lib/dovecot/pop3
Thanks
AndrewM

Setup changes 1.x to 2.x -- custom POP3 account handling required.

Andrew McGlashan