The failed message will often have the original sender's IP address.
If it does, best check it to make sure its some Russian IP address
rather than one connected to you.
In the past I've had literally thousands of bounced emails when someone
unpleasant was trying to add credibility to their spam.
Just to be clear and despite what others have said:
There is no reason to think you have been hacked or infected in any way.
Normally it is simply a question of spammers falsifying the 'from' field
in the emails they send out, by using any old email address they have
among the thousands they have harvested. So they are only pretending
their spam comes from you. There isn't much you can do about it.
In my friend-with-BT-mail's case, his account had been compromised, and
we finally discovered what had been done - the reply-to AND mail
forwarding had been set to a spurious outlook.com address.
Not that BT was the slightest help in identifying which one
But do check to see that accounts have not been compromised byt looking
at te IP addtess of the original sender
"What do you think about Gay Marriage?"
Your email address (and likely millions of others) is being used as the
source address for a spam campaign. By using a selection of addresses it
makes it harder to block based on simple metrics like sender address.
Its also "good" (for the spammer) since if they are using compromised
PCs to run the campaign, the bounces are not going back to the real
senders which may alert them to a problem.
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