getting thousands of mail delivery failure emails

This happened before, seems someone is sending out spam on my account. I use prodigy.net.mx for POP3, and Gmail for SMTP. I've changed both passwords, and run an AVG virus check, and nothing was found.

They are literally coming in hundreds an hour, what else can I do? I use Thunderbird as my client.

Thanks.
mel200Asked:
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JohnBusiness Consultant (Owner)Commented:
someone is sending out spam on my account  <-- It is your account and you are doing it. So assuming not deliberately so, the account must have been hacked (I have seen this before).

Change the passwords again and make sure they are strong passwords. Then let the mail come in until it is cleared out and delete it all (this will take some time).

Now that the passwords have changed, the problem should stop.
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mel200Author Commented:
The passwords we changed to this morning were already strong, I think we need more help, but thanks.
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JohnBusiness Consultant (Owner)Commented:
Once passwords have changed, the hacking should stop. I do suggest a second change.

Then, once the issue has stopped, you still need to let the mail clear out. I have see this before.
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mel200Author Commented:
However, we will generate a very strong password and try it.
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mel200Author Commented:
I just realized I haven't been getting any for the past half hour. Maybe whoever was logged in kept sending them, then when they logged out, they couldn't log back in, so it stopped.

However, as I said, I will change the password to something super-strong.
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JohnBusiness Consultant (Owner)Commented:
Yes. Changing the passwords prevent re-entry. That is why I suggested this.

Once no more are coming in, it is just (BIG just) a matter of clearing them out.
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Dave BaldwinFixer of ProblemsCommented:
If these are "Non-Delivery Response", they do not have to be coming from your own email accounts.  One of the methods of spam is to send to a non-existent email address with your email as the 'From:' or the 'Reply-To:'.  That way when it bounces it comes back to you and not to them.  Cause nobody blocks their own email address.
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mel200Author Commented:
You have to let the mail clear out, and it may take a few hours for the attacker to log off the account.
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JohnBusiness Consultant (Owner)Commented:
@mel200  - Thanks and I was happy to help. Good luck once the mail has cleared out.
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mel200Author Commented:
Dave, "If these are "Non-Delivery Response", they do not have to be coming from your own email accounts.  One of the methods of spam is to send to a non-existent email address with your email as the 'From:' or the 'Reply-To:'.  That way when it bounces it comes back to you and not to them.  Cause nobody blocks their own email address. "

Is there help for this?
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Dave BaldwinFixer of ProblemsCommented:
Not unless you can find out where they are actually coming from and have their ISP or web host shut them down.  Often the 'bad guys' IP is not in the bounced email which makes it difficult to find them.
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mel200Author Commented:
OK, thanks, Dave. Meanwhile we seem to be ok again.
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Dave BaldwinFixer of ProblemsCommented:
I'm glad it's stopped.
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