Quick questions

 

You have received message about the undelivered email that appear to originate from your email address. In addition the name of your computer or provider mentioned in such message is wrong. Don’t pay any attention on such letter, it wasn’t sent from your email address – it was sent by spammers.

 

Unfortunately it’s possible to forge the sender address. If the receiving server does not make additional checks (SPF, DKIM) it’s possible to send letter from any email address.

 

The mail server having rejected the letter can send to the sender the bounce message of non-delivery (Non-Delivery Report, NDR). Since the address of the sender is forged, the user can receive set of messages on non-delivery. Such incorrect automated sending of bounce messages by mail servers is called backscatter.

See here for more details about spam.
Some advices of how to reduce spam amount in the mailbox.

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How to clear the "Trash" and the folder "Spam"

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Mailbox optimization.

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Folder "Lists" and "Social"

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The personalized letters or why my name /data are in the spam letter?

What is SPAM and what it’s used for?

After mailbox status change, can not receive e-mails

Appointment of a folder

Create new folder

Letters and pictures size on the computer screen

Message sorting

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What means "mailbox is over quota"?

Filter rule: ignore SPAM rules

Filter rule: redirect to another e-mail

Why my sent e-mails go to «Lists» or «Social» folders

Advices of how to reduce spam amount in the mailbox

I am receiving emails addressed to other users

I have received an e-mail from unknown sender and when I try to reply, I get a message saying that this address doesn't exist

Increased spam protection.

Remote image blocking

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Messages per page in the mailbox view

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I removed all messages, but my mailbox is still full

My mailbox is full, how to solve this problem

Filter rule: delete message

Report spam

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After portal update I can't open mailbox page or don't see changes

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What to do if you don't want recipients to receive messages with winmail.dat attachment?