I have been getting some 'Delivery Failure" or “Mail Delivery Failed” messages. One has an attachment that I won’t open. I never sent emails to these addresses. Is this some type of virus?
This is most likely fake, it is so easy to fake who the email is from and its content looks harmless.
Even if you try what can you do about the fact your email didn’t get through, nothing. Delete them from the server rather than download them.
A very likely cause is that someone with your email address in their email address book is infected and that virus has forged the senders address using the address book; so any bounced email would be wrongly directed back to you.
I filter all my email at the server using mailwasher pro 4.1
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Spammers will try anything to get you to at least download their email, then you wil see the true message is one of spam.
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Those with evil intention would also hope you open the harmless looking bounced email.
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Keep doing what you are doing, exercise caution and use avast!
HTH David