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MIME. Multipurpose Internet Mail Extensions (MIME) is a standard that extends the format of email messages to support text in character sets other than ASCII, as well as attachments of audio, video, images, and application programs. Message bodies may consist of multiple parts, and header information may be specified in non-ASCII character sets.
S/MIME. S/MIME (Secure/Multipurpose Internet Mail Extensions) is a standard for public-key encryption and signing of MIME data. S/MIME is on an IETF standards track and defined in a number of documents, most importantly RFC 8551. It was originally developed by RSA Data Security, and the original specification used the IETF MIME specification [1 ...
Media type. In information and communications technology, a media type, [1][2] content type[2][3] or MIME type[1][4][5] is a two-part identifier for file formats and content formats . Their purpose is comparable to filename extensions and uniform type identifiers, in that they identify the intended data format.
Email attachment. An email attachment is a computer file sent along with an email message. One or more files can be attached to any email message, and be sent along with it to the recipient. This is typically used as a simple method to share documents and images.
Email protocols. The Internet Message Access Protocol is an application layer Internet protocol that allows an e-mail client to access email on a remote mail server. The current version is defined by RFC 9051. An IMAP server typically listens on well-known port 143, while IMAP over SSL/TLS (IMAPS) uses 993. [2][3]
Mimecast Limited is an [5][6] American–British, Jersey -domiciled company specializing in cloud-based email management for Google Workspace, Microsoft Exchange and Microsoft Office 365, [7] including security, archiving, and continuity services to protect business mail.
Technical overview. AS2 is specified in RFC 4130, and is based on HTTP and S/MIME. It was the second AS protocol developed and uses the same signing, encryption and MDN (as defined by RFC3798) conventions used in the original AS1 protocol introduced in the late 1990s by IETF. In other words:
The basic Internet message format used for email [33] is defined by RFC 5322, with encoding of non-ASCII data and multimedia content attachments defined in RFC 2045 through RFC 2049, collectively called Multipurpose Internet Mail Extensions or MIME.