I noticed a few emails being bounced back to me from fake/non-existant email accounts including my domain name (ie. firstname.lastname@example.org which 'finance' doesn't exist) a month or 2 ago but didn't take much notice of it (I know, I should have ). I use this particular site/domain solely for email communication...there's no web pages on it...& I noticed this morning that just a little over halfway through the month, it was showing a bandwidth usage of 1.3G!!!
In the past, as it's only used for email, it's used no more than about 20MB for the whole month! I double checked the AWStats for it, & there have only been 23 people who've gone to the site (which doesn't exist anyway) this month, so the only reason I can think of for the high bandwidth usage is spammers .
I've changed all the passwords for the site this morning, but is there anything else I should be looking for or doing to stop this?