Tere.
%c expands to "secured" or empty. So you could use eg.
passdb pam {
  args = %s%c
}

and create imap, imapsecured, pop3, pop3secured

More better, so for example user1 can access only imaps, using Yous suggestion, I have to list all users, except user1 in imap, pop3, pop3secured. But it should works also in other way, that by default all users are allowed to use all protocols and then I exclude user1 from imap, pop3, pop3secured. So I tried:

passdb pam {
 args = %s%c
}

/etc/pam.d/ includes imap, imapsecured, pop3, pop3secured files which includes:

auth required pam_nologin.so auth required pam_stack.so service=system-auth account required pam_stack.so service=system-auth
session    required     pam_stack.so service=system-auth

and only imapsecured has this  line:

auth required pam_listfile.so item=user sense=deny file=/etc/imapsusers onerr=succeed

and /etc/imapsusers includes user1

But now even pop user can't login:(.

--
Mart

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