Outlook Mail

"When links to pictures are resolved, a request is made to the sender's server, which indirectly acts as a 'receipt.' SPAMmers use these receipts as confirmation that their unsolicited mail is reaching its intended target. The default setting prevents the sender from knowing you've received their email. Ideally, you would delete the email based on the sender name, subject and text and the sender would eventually prune your address from their SPAM list."


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