Directbuy spam not going through spamassassin

[i.troll]

I've noticed a lot of spam lately coming in with a subject of "Visit DirectBuy's......." Or various other subjects containing the name DirectBuy. However I have also noticed that all of these emails do not have any spamassassin headers on them, or any of the SPF check headers either.

Does anyone know what I can look at to determine why these emails seem to be bypassing all the checks and are getting through?

Thanks

[scott]

size? usually if a message is above 256k SA wont check it

[i.troll]

I did not even think about size being part of it. looks like the latest one I got was 263k. so just over the limit.

Is there another way to deal with this type of spam? upping spamassassins size limitation? or does upping that limit cause potential memory issues?

[scott]

Just that it uses more memory, I personally use 2MB as a limit.