DWA body of mail only partial visible due to acf

several users complain that the body of a mail is gone and only the message that the sender’s mailbox is protected by spamfighter is visible, attachments are visible. When I look into the source it is all commented out by ACF, apart from the signature of spamfighter. I don’t see any active content in the body. It is a rather simple message.

When I change the message (e.g. add a space in the second empty line) the message is displayed in DWA.

I am not sure whether spamfighter causes ACF to react like this, are there any experiences?

Regards

Walter Mobach