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

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After mailbox status change, can not receive e-mails

What is SPAM and what it’s used for?

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Increased spam protection.

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Advices of how to reduce spam amount in the mailbox

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Non of the buttons work

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Filter rule: ignore SPAM rules

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

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

Why are emails going into the Spam folder? How spam is detected?

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

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Forward a letter

Why incoming message list don’t open from the first page by default?

Is it possible to revoke sent message?

Filter rule: redirect to another e-mail

When I send a message, my personal information isn't correct

Mailbox optimization.

Filter rule: redirect and leave a copy

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How to delete folders

Virus protection

Redirect email

What do I need if I want to enter my mailbox

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

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Create new folder

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Remote image blocking

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I removed all messages, but my mailbox is still full

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I need a larger mailbox