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The format of an email address is local-part@domain, where the local-part may be up to 64 octets long and the domain may have a maximum of 255 octets. [5] The formal definitions are in RFC 5322 (sections 3.2.3 and 3.4.1) and RFC 5321—with a more readable form given in the informational RFC 3696 (written by J. Klensin, the author of RFC 5321) and the associated errata.
Some other programming languages have varying case sensitivity; in PHP, for example, variable names are case-sensitive but function names are not case-sensitive. This means that if a function is defined in lowercase, it can be called in uppercase, but if a variable is defined in lowercase, it cannot be referred to in uppercase.
JavaScript is case sensitive. It is common to start the name of a constructor with a capitalised letter, and the name of a function or variable with a lower-case letter. Example:
• 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.
With both secure messaging and webmail, all email data is stored on the email provider's servers and thus subject to unauthorized access, or access by government agencies. However, in the case of email clients, it is possible to configure the client such that the client downloads a copy of the message as it arrives, which is deleted from the ...
A Uniform Resource Identifier (URI), formerly Universal Resource Identifier, is a unique sequence of characters that identifies an abstract or physical resource, [1] such as resources on a webpage, mail address, phone number, [2] books, real-world objects such as people and places, concepts. [3]
The RFC and the IANA's list of transfer encodings define the values shown below, which are not case sensitive. '7bit', '8bit', and 'binary' mean that no binary-to-text encoding on top of the original encoding was used. In these cases, the header field is actually redundant for the email client to decode the message body, but it may still be ...
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