Tickets :: Comment on [#13851] 8bit/binary Content-Transfer-Encoding should not be used via SMTP channel

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Comment	> Sorry, if the problem has already been solved (6.1.7 is not the most > recent of IMP), but I couldn't find such bug reports searching your > tickets. > > Our problem is, that an ISP started to use IMP as its webmail, and > since that point we started to receive malformed attachment contents. > The problem is that the XML based content is attached with > Content-Transfer-Encoding: 8bit, while it contained lines longer than > 1000 characters. > > Referring to Rfc 2045 (MIME): >> 6. Content-Transfer-Encoding Header Field >> >> Many media types which could be usefully transported via email are >> represented, in their "natural" format, as 8bit character or binary >> data. Such data cannot be transmitted over some transfer protocols. >> For example, RFC 821 (SMTP) restricts mail messages to 7bit US-ASCII >> data with lines no longer than 1000 characters including any trailing >> CRLF line separator. >> >> It is necessary, therefore, to define a standard mechanism for >> encoding such data into a 7bit short line format. Proper labelling >> of unencoded material in less restrictive formats for direct use over >> less restrictive transports is also desireable. This document >> specifies that such encodings will be indicated by a new "Content- >> Transfer-Encoding" header field. This field has not been defined by >> any previous standard. > > Accordingly 8bit and binary Content-Transfer-Encodings can be used > for ex. HTTP POSTs, however these are not to be used if the > transmission channel is SMTP, since Rfc 821 (SMTP) allows any SMTP > servers to break lines longer than 1000 characters or convert bodies > to 7bit by will. Since IMP is webmail client we might state that > every MIME structures it creates will be transferred via SMTP, > therefore the usage of 8bit and binary transfer-encodings are > contraindicated. > > Thx for your kind help!
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