Getting doubled alerts

["Brehm, Scott" <sbrehm (at) titan.com>]

Is it normal to get two alert messages if an event matches two rules? Is
there a keyword to suppress multiple alert emails from the same event?
I've been running 4.0 for a while, but just getting in to configuring
alerts. My hobbit-alerts.cfg includes the following:
 
HOST=* SERVICE=conn
        MAIL sbrehm (at) titan.com COLOR=red
 
HOST=%atscm
        MAIL sbrehm (at) titan.com COLOR=red
        MAIL person2 (at) titan.com COLOR=red
 
HOST=%atscs
        MAIL sbrehm (at) titan.com COLOR=red
        MAIL person3 (at) titan.com COLOR=red
 
I want alerts for any connection problems, but only want alerts for
other hosts if they come from two specific sets of hosts. Unfortunately
I'm getting a match for both the first rule and the second or third rule
when there is conn alert for one of the two. I'm now using
EXSERVICE=conn for myself on rules two and three, but still curious.
 
Scott Brehm

IT Manager
L3 Communications - Titan (ATS/ATAG)
3394 Carmel Mountain Rd, San Diego CA, 92121
858-720-4035