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A file signature, also known as a magic number or magic byte, is data used to identify or verify the content of a file. This web page lists various file signatures and their hexadecimal, ISO 8859-1, and extension codes.
If you have problems sending AOL Mail, you may need to restart your computer, update your browser, disable pop-up blocker, or reset your firewall. Learn how to fix common sending errors, image challenges, and missing images in this article.
Learn how to update your AOL Mail settings to personalize your inbox, compose messages, block senders, filter emails, and more. Find the links to access each setting and get live support if you need help.
Learn how to fix problems with Outlook or Thunderbird when accessing AOL Mail. Update your password, check your IMAP settings, and update your email client application.
DKIM is an email authentication method that detects forged sender addresses and verifies the sender's domain. It adds a digital signature to each email message that can be verified by the recipient using the sender's public key in the DNS.
Learn about the meaning and usage of HTTP response status codes, which indicate the server's response to a client's request. The codes are classified into five categories: 1xx, 2xx, 3xx, 4xx, and 5xx.
Find answers to common questions and issues about AOL Mail, such as how to create a signature, add images, fix errors, and more. Get live chat or phone support from AOL experts or browse the articles and tutorials for help.
Learn what the User-Agent header is and how it identifies the user agent responsible for making a given HTTP request. Find out the format, use, and examples of user agent strings for browsers and bots.