8BITMIME

8BITMIME

8BITMIME (RFC 1652) is an SMTP extension standardized in 1994 that facilitates the exchange of e-mail messages containing octets outside the seven-bit ASCII range. Prior to the availability of 8BITMIME implementations, mail user agents employed several techniques to cope with the seven-bit limitation, including binary-to-text encodings and UTF-7. However, each of these workarounds necessarily inflates the bandwidth of non-ASCII transmissions.

At least the following servers advertise the 8BITMIME extension:
* Apache James (since 2.3.0a1) [http://james.apache.org/server/2.3.0/changelog.html]
* Courier Mail Server
* ESMTP [http://esmtp.sourceforge.net/]
* IIS SMTP Service
* Lotus Domino
* Maillennium [http://www.maillennium.com/]
* Microsoft Exchange Server (as of Exchange Server 2000)
* Novell GroupWise
* Postfix
* Sendmail (since 6.57)
* SubEtha [http://subetha.tigris.org/]

The following servers can be configured to advertise 8BITMIME, but do not fully implement the standard:
* Exim (eight-bit clean, but does not translate eight-bit messages to seven-bit when relaying to non-8BITMIME peers)
* qmail (does not translate eight-bit messages to seven-bit when relaying to non-8BITMIME peers, as is required by the RFC [http://cr.yp.to/smtp/8bitmime.html] , [http://www-dt.e-technik.uni-dortmund.de/~ma/qmail-bugs.html] )

As of June 2005, the following servers do not implement the extension:
* Microsoft Exchange Internet Mail Service (through version 5.5)
* Netscape Messaging Server 4.15

ee also

* List of mail servers
* RFC 3516, IMAP4 Binary Content Extension


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