Something fishy here?

[parkypoo22]

Took a periodic look in mailscanner only to find some odd things.

None existant accounts on my domain are sending emails to other none existant accounts on my domain again. Not to fussed about that, the only problem is one of these none existant accounts is sending and recieving emails from my banks support system!

Should i be worried, or take any action?

[ ] 28/08/06
16:24:18 [email protected] [email protected] 1.3Kb 0.00 Spam
[ ] 28/08/06
16:23:12 [email protected] [email protected] 1.3Kb 0.00 Spam
[ ] 28/08/06
16:15:50 [email protected] [email protected] 1.3Kb 0.00 Spam
[ ] 28/08/06
16:15:44 [email protected] [email protected] 1.3Kb 22.05 Spam
[ ] 28/08/06
16:14:50 [email protected] [email protected] 1.3Kb 22.05 Spam
[ ] 28/08/06
16:11:17 [email protected] [email protected] 1.3Kb 0.00 Spam
[ ] 28/08/06
16:07:59 [email protected] [email protected] 1.2Kb 22.05 Spam
[ ] 28/08/06
16:05:08 [email protected] [email protected] 1.3Kb 0.00 Spam