A few months ago, I used rmail to read my mail. Since a few months, I use Gnus
to read my mail.
This works fine for me, except for one thing: when using rmail, if I read my
mail, the 'Mail' indication in the mode line was gone immediately. But now,
when using Gnus, the 'Mail' indication disappears at the moment the clock
changes. Worst case, it takes one minute before the indication is gone.
Q: How can I change this, in order to get rid of the 'Mail' indication
immediately when reading the mail?