Delivery errors for emails you never sent can be alarming, and with good reason. These messages may point to a spammer or virus using your email address. But you can generally ignore them.
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Gmail messages not delivered ??? WTF – TLS negotiation failed / The business side of photography
Spammers rarely send their unwanted messages with their own email address in the From field. Not only would this reveal their identity, but it would also allow recipients to write angry replies. (However, you can still find out where the spam originated and complain to the spammer's ISP.)
Writers of worms and viruses want the opposite of what spammers want, but the results are similar. For infections to spread, social engineering is essential, and the crucial point is that the malicious code appears to come from a friend or trusted source.
At the same time, the From line should not contain the email address of the owner of the infected computer. The response from a virus filter notifying them that their computer was infected could alert them. This is why worms put real, but random, addresses in the From line. They usually get them from the email clients' address books.
