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Client Author/Developer Operating system Software license User Interface Alpine: University of Washington: Cross-platform: Apache-2.0: TUI: Apple Mail: Apple
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 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.
In iOS 18.2 and later, Apple's Mail app enhances email management by automatically sorting messages into distinct categories to help find emails faster.
Authorized under an act by the United States Congress, the first two-dollar bill was issued in March 1862 [5] and the denomination was continuously used until 1966; by that time, the United States Note was the only remaining class of U.S. currency to which the two-dollar bill was assigned.
The Simple Mail Transfer Protocol (SMTP) is an Internet standard communication protocol for electronic mail transmission. Mail servers and other message transfer agents use SMTP to send and receive mail messages.
DMARC operates by checking that the domain in the message's From: field (also called "RFC5322.From" [2]) is "aligned" with other authenticated domain names.If either SPF (specified using the aspf field) or DKIM (specified using the adkim field) alignment checks pass, then the DMARC alignment test passes.