I have received a lot of bounce-back emails for emails I didn't send.

This can mean that a spammer has gained access to your mailbox and is using it to send spam emails. There are two main ways this can happen: either the password can be guessed by brute force, or it can be captured by malware on a computer it has been used on. You should change the password to something strong and unique immediately and also run antivirus and malware scans on any computer that has been used to connect to the mailbox.

  • 6 Users Found This Useful
Was this answer helpful?

Related Articles

Why have my mail/folders disappeared from webmail?

Occasionally, the thread view in Webmail will make emails apparently disappear -...

Sending an email from an Exchange mailbox to a specific recipient fails

If you encounter a problem sending an email from your Exchange mailbox to a...

Why is my mail client downloading duplicates of existing emails?

This issue will only occur when downloading mail via POP3. It is not something to...

I'm getting a 451 Message temporarily deferred message when sending to Yahoo or BT - What does this mean?

Yahoo have extremely strict criteria for accepting email and often defer e-mail...

My ISP is Telia. I cannot to connect to the outgoing mail server?

Telia requires that customers use their relay of smtprelay1.telia.com as the...