Please use Edit to remove your email address from your post before spammers and bots find it as this is a public forum.

Could you please explain in some detail what emails and where are the from as unless you have signed up for a News Letter Mozilla.org does not send anything and never forwards.

Please look in the headers of the email for the information of where and who it was sent from. These can still be forged though. Let us know what it says in the Headers.

In addition to the above :

If you're getting emails from strangers : sounds like you're getting spam ....

Firefox is a browser, and doesn't 'do' email, so you'll need to contact your email provider.

Would you please take a look at this article :

https://support.mozilla.org/en-US/kb/problems-with-email-how-to-find-help

In case you're using Thunderbird - you can post your question on their support forum :

https://support.mozilla.org/en-US/products/thunderbird

(click on the 'Ask a Question' at the top of the page)