Should I Disable Bad Header Filtering on my mail server?

Do I lose more emails than prevent spam?

[bouncybunny]

My server has a number of complex spam filters emnabled by default and generally this works very well.

However, I know that a couple of emails have gone missing recently and bad headers may well be the cause - I know that the companies responsible are small and their mail servers are probably not set up as perfectly as they should be. Having said that, Yahoo and Hotmail are happy to accept their emails, although my server's default setup tends to blackhole them.

My feeling is that bad headers, on their own, is not a good enough reason to consider a mail server a sender of spam.

Anyone feel like chiming in with some thoughts?

[piatkow]

False positives are always a problem.

At work all spam is quarentined and every valid recipient gets a summary letting them download anything that looks genuine.

As volunteer webmaster for a local charity I route the spam to a folder for a fortnight before the copy date of their quarterly newsletter and eyeball all the traffic for false positives (about 10 - 15 spams per day). False positives get white listed and after than it goes back to auto delete.