How do I stop others from sending spam email that look as if they are coming from my company?

Todd: How do I stop others from sending spam email that look as if they are coming from my company?
I frequently get “Undeliverable Mail” messages. When I look at who it was sent to there are sometimes a list of 20 addresses and the messages have my email address as the sender. I am not sending these spam email, so someone is using my address. How can I stop them or find out who is sending these emails?

Answers and Views:

Answer by Alex H
Your password has been compromised. Change your password.

Answer by LoneStar
It’s called “spoofing”, and changing your password won’t stop it.

Spoofing is the “forgery” of an address, to hide the identity of the sender, and is usually done by an Automatic Spamming system, that blindly and randomly, runs through addresses in sequence.
It’s not actually coming from or thru your account. (see in your sent folder)
One type that’s called “Self Spamming”–(go figure)–appears to be coming “from” and going “to” the same address.

Anti-spam experts say—-There’s nothing you can do, except delete them (unopened of course). They are a nuisance, but harmless (as long as you don’t open any links in them)—and don’t last long.
If you spam them–you’d only be spamming your own address.

Answer by Zhengdan
Your password has been compromised. Change your password.

Answer by Lyn G
Sounds like your E-mail account has been compromised, or you picked up a virus, Todd.
Immediately have your computer checked for a ‘bug’ or ‘bugs.’ If you have the proper programs, do the scans yourself, if not you need to take your computer to some one who can.
Once it is clean of pests, install a firewall and an anti-virus program if you do not have one yet.
I strongly recommend a program for malware and adware also.
After you finish this, then go in and change your password, using a good strong one.
Also, check your account information and make sure no information was changed, if it was change it back immediately.
Then, you will have to inform your contacts that it was not you sending that mail, but they need to check their computers in case they were also infected.