[Dovecot] Auth checking also the service

Hello everyone. I'm switching to dovecot from courier-imap and after some problems with Apple Mail client, now everything seems to be fine. The only problem that I have not solved yet is to check also the service (pop3, pop3s, imap, imaps) in the authentication phase. In courier-authlib I do this:

MYSQL_SELECT_CLAUSE SELECT username,
password,
"",
1002,
1003,
'/vmail',
maildir,
quota,
name,
""
FROM mailbox
WHERE username="$(local_part)@$(domain)"
AND active=1
AND $(service)=1

where $(service) can be pop3, pop3s, imap or imaps. Is it possible to do a similar thing in dovecot?

Thank you in advance,

Alex