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For example, an email intended for the user-entered email address foo+bar@example.com could be incorrectly sent to foobar@example.com. In other cases a poor user experience can occur if some parts of a site, such as a user registration page, allow the "+" character whilst other parts, such as a page for unsubscribing from a site's mailing list ...

Message-ID is a unique identifier for a digital message, most commonly a globally unique identifier used in email and Usenet newsgroups. Message-IDs are required to have a specific format which is a subset of an email address and be globally unique. No two different messages must ever have the same Message-ID.

International email arises from the combined provision of internationalized domain names ( IDN) and email address internationalization ( EAI ). The result is email that contains international characters (characters which do not exist in the ASCII character set), encoded as UTF-8, in the email header and in supporting mail transfer protocols.

WFH – work from home. Used in the subject line or body of the email. 1L – One Liner. Used at the beginning of the subject when the subject of the email is the only text contained in the email. This prefix indicates to the reader that it is not necessary to open the email.