Does anyone out there have any accurate information on virus affecting mac's.

This is from our resident "virus expert": http://www.reedcorner.net/mmg/

If you have specific questions, you should ask them.

None.

Helpful Links Regarding Virus Protection

An excellent link to read is Tom Reed's Mac Malware Guide.

Also, visit The XLab FAQs and read Detecting and avoiding malware and spyware.

If you require anti-virus protection I recommend using ClamXav.

Melrose Hill wrote:

Does anyone out there have any accurate information on virus affecting mac's.

Yes, and there are none currently known to exist. Also no currently known malware that can impact a fully up-to-date OS X 10.6.8 or above.

What else would you like to know about them.

There are many forms of ‘Malware’ that can affect a computer system, of which ‘a virus’ is but one type, ‘trojans’ another. Using the strict definition of a computer virus, no viruses that can attack OS X have so far been detected 'in the wild', i.e. in anything other than laboratory conditions. The same is not true of other forms of malware, such as Trojans. Whilst it is a fairly safe bet that your Mac will NOT be infected by a virus, it may have other security-related problem, but more likely a technical problem unrelated to any malware threat.

You may find this User Tip on Viruses, Trojan Detection and Removal, as well as general Internet Security and Privacy, useful:

https://discussions.apple.com/docs/DOC-2435

The User Tip (which you are welcome to print out and retain for future reference) seeks to offer guidance on the main security threats and how to avoid them.

iomart is an independant cloud service offering web mail. No idea why you are using them, but you will have to ask them why they are sending you duff information.

Can you copy/paste one of the messages here?

You can read about Iomart here:

http://www.iomart.com/

Who is your ISP?

Have you tried to email anyone with a iomart email address?

Melrose Hill wrote:

Warning. Still could not deliver email.

Looks to be a standard, automated non-delivery notice from iomart.

I suspect somebody has sent spam e-mails to a number of people at iomart using your e-mail address.

See Thomas' Someone is sending messages from my e-mail address!

That's definitely not caused by any kind of malware infection on your machine.

One likely possibility - probably the most likely - was already addressed by MadMacs0.

Another possibility is that you have some kind of auto-response rule set up, either in Mail or on the mail server. A bad auto-responder would send an automatic response every time one of those undeliverable mail notifications arrived in your Inbox, thus creating an "infinite mail loop." Check your mail rules, both in Mail's preferences and on your e-mail server.