E-mails hijack by worm virus?

Okay I've notice that lately that two of my domain e-mail address seem to be hi jack by worm viruses.

I know cause support@domain.com sends an e-mail with an attachment to addess to letter@domain.com. And letter@domain.com sends an e-mail with an attachment to address support@doman.com.

Basically I have two accounts sending mails with virus attachments to one another. I did a scan with mailscanner and it doesn't seem to show that my e-mail account was infected. I scan my computer and my e-mail accounts don't seem to be infected. How do I stop my two domain e-mails account from sending e-mail viruses to one another and to other e-mail accounts?

 

 

 

 

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