ipf blocking pass rule

[James Bowman Sineath, III]

I have the following rule in my ipf.rules:

pass in log first quick on xl0 proto tcp from any to any port = 25 keep 
state

for some reason it will pass the first connection but block the next. A log 
is below. Any ideas on why this is happening would be much appreciated.

Jun  8 16:11:38 fenrir ipmon[202]: 16:11:34.521157 xl0 @0:6 p 
imf17aec.mail.bellsouth.net[205.152.59.65],35968 -> 
10.0.10.20[65.0.232.44],smtp PR tcp len 20 48 -S 2159541450 0 25416 K-S IN
Jun  8 16:16:42 fenrir ipmon[202]: 16:16:41.852047 xl0 @0:6 b 
imf17aec.mail.bellsouth.net[205.152.59.65],35968 -> 
10.0.10.20[65.0.232.44],smtp PR tcp len 20 40 -AR 2159543277 3340325284 0 
K-S IN