mboxcl and mboxcl2 originated from the file format used by Unix System V Release 4 mail tools. Each originated from a different version of Unix. Bernstein, Rahul Dhesi, and others in 1996. The naming scheme was developed by Daniel J. ![]() Over the years, four popular but incompatible variants arose: mboxo, mboxrd, mboxcl, and mboxcl2. The mbox format uses a single blank line followed by the string 'From ' (with a space) to delimit messages this can create ambiguities if a message contains the same sequence in the message text. ( March 2021) ( Learn how and when to remove this template message) Please help improve it to make it understandable to non-experts, without removing the technical details. This section may be too technical for most readers to understand. In 2005, the application/mbox media type was standardized as RFC 4155, which hinted that mbox stores mailbox messages in their original Internet Message (RFC 2822) format, except for the used newline character, seven-bit clean data storage, and the requirement that each newly added message is terminated with a completely empty line within the mbox database. However, the POSIX standard defined a loose framework in conjunction with the mailx program. ![]() Unlike the Internet protocols used for the exchange of email, the format used for the storage of email has never been formally defined through the RFC standardization mechanism and has been entirely left to the developer of an email client. The maildir mailbox format is often cited as an alternative to the mbox format for networked email storage systems. Other systems, such as Microsoft Exchange Server and the Cyrus IMAP server, store mailboxes in centralized databases managed by the mail system and not directly accessible by individual users. Ī format similar to mbox is the MH Message Handling System. RFC 4155 defines that a UTC timestamp follows after another separating space character. ![]() Each message starts with the four characters "From" followed by a space (the so-called "From_ line") and the sender's email address. It was first implemented in Fifth Edition Unix.Īll messages in an mbox mailbox are concatenated and stored as plain text in a single file. Mbox is a generic term for a family of related file formats used for holding collections of email messages. ( Learn how and when to remove this template message) Please help update this article to reflect recent events or newly available information.
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