Alert function wont work!

list Adam Tetz
Wed, 20 Feb 2008 15:48:25 +0100
Message-Id: <user-00e27fe6daef@xymon.invalid>

I think there is a e-mail account installed because with "mailq" shows :

48h        6.8k    1jrcnm-0000l3-3h <> *** frozen ***
                  user-09dcc036b3a8@xymon.invalid

How can i install an other e-mail account?
-- 
Regards,

Adam Tetz