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Check your Sent folder to see if anything is in there that you know you didn't send. If there is, then the account has been compromised. In that case you need to change the password to something a lot stronger than whatever it is right now, and also change the secret question and answer for the account.
If the Sent folder looks OK, then the most likely thing is that your account is being "spoofed". Spammers can make it look like emails came from you when in fact they did not. If that is the case, there is nothing you can do except notify your contacts of the problem and wait it out. Once a spammer has your email address there is nothing you can do to stop it. But in order to avoid detection they will usually only use an address for a few days or a week and move on to annoy someone else.
Also, use your A/V software to run a complete scan of your machine to see if it can find anything wrong.
I get the message "The IMAP server mail.comcast.net is not responding.". I have checked and rechecked the settings, password, etc. & that is all correct. I recently received multiple "mailer-daemon" notices about unsent emails that I did not send. Have I been hacked? I have changed my password. Talked to a Comcast support rep on the phone who was not helpful, just told me to try changing my password again. Do I need to go into a Comcast store???? Help!!