Monitoring mailbox in Maildir format with bash and pam_mail

After switch to Maildir format mailbox my bash stopped monitoring new mail. To bring this functionality back I need to set location of my new mailbox:

export MAIL=~/Maildir

And after $MAILCHECK seconds I got You have new mail in /home/kb/Maildir.

To set $MAIL for all login shells and for all user I use pam_mail. To enable checking ~/Maildir for new mail use:

session    optional standard dir=~/Maildir

Probably modification in /etc/pam.d/login and /etc/pam.d/sshd are sufficient.