I can see where that might happen if your e-mail/domain situation is similar to mine:
The idea behind Mailwasher is to help reduce SPAM by:
But if you bounce the SPAM back (as I do), a different situation arises.
Mailwasher has you specify an e-mail address that will be shown to the spammer when Mailwasher bounces his SPAM back to him. It effectively tells the spammer, "No one here at this address." The brighter spammers know of this tactic.
If you have your own internet domain (e.g., "www.stolarstorm.com") and can receive e-mail there (stolarstorm@stolarstorm.com) or via the ISP that hosts the space (stolarstorm@hostingisp.com), you would specify ONE of those two addresses in Mailwasher as your "no one here" address.
Let's say you select "stolarstorm@hostingisp.com" as that address.
If the spammer sent the SPAM to stolarstorm@stolarstorm.com, Mailwasher would identify it as SPAM and bounce it back, saying, "there's no one here by the name stolarstorm@hostingisp.com."
But the spammer knows he sent his SPAM to stolarstorm@stolarstorm.com. So the bounce can tip him off to a connection between "stolarstorm@hostingisp.com" and "stolarstorm@stolarstorm.com". The spammer then has TWO e-mail addresses on you.
What to do? Here's what I've done, with good results: