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W3C Markup Validation Service. Tag certifying that a website has been checked for well-formed XHTML (above) and CSS (below) markup. The Markup Validation Service is a validator by the World Wide Web Consortium (W3C) that allows Internet users to check pre-HTML5 HTML and XHTML documents for well-formed markup against a document type definition.
Email authentication, or validation, is a collection of techniques aimed at providing verifiable information about the origin of email messages by validating the domain ownership of any message transfer agents (MTA) who participated in transferring and possibly modifying a message. The original base of Internet email, Simple Mail Transfer ...
Help:Markup validation. The W3C Markup Validation Service lets editors check web pages for conformance to HTML and XHTML standards. It is helpful for catching minor problems such as duplicate section names or citation IDs. Although most major browsers will tolerate many of the errors, and will display a document successfully even if it contains ...
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Email address internationalization provides for a much larger range of characters than many current validation algorithms allow, such as all Unicode characters above U+0080, encoded as UTF-8. Algorithmic tools: Large websites, bulk mailers and spammers require efficient tools to validate email addresses.
• Fake email addresses - Malicious actors sometimes send from email addresses made to look like an official email address but in fact is missing a letter(s), misspelled, replaces a letter with a lookalike number (e.g. “O” and “0”), or originates from free email services that would not be used for official communications.
HTML email. HTML email is the use of a subset of HTML to provide formatting and semantic markup capabilities in email that are not available with plain text: [1] Text can be linked without displaying a URL, or breaking long URLs into multiple pieces. Text is wrapped to fit the width of the viewing window, rather than uniformly breaking each ...
Add an extra security step to sign into your account with 2-step verification. Find out how to turn on 2-step verification and receive a verification code, and how to turn off 2-step verification if you need to.