October 2007
Intermediate to advanced
1308 pages
161h 13m
English
Content preview from sendmail, 4th EditionBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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$=s
Presume an RFC2822 7-bit body V8.7 and later
An email message as defined by RFC822 cannot contain
8-bit data. Consequently, when the MIME Content-Type: header
declares a message subtype that is rfc822, we immediately
know that it will contain nothing that needs 8- to
7-bit encoding:
Content-Type: message/rfc822
As other message subtypes evolve, this assumption can
safely be made about them too. So, to make
sendmail more adaptable, the
$=s class was
added beginning with V8.7. This class contains a
list of subtypes that should be treated the same as
rfc822. When
sendmail first begins to run,
it initializes that list to contain:
rfc822
Other subtypes that can legitimately appear here might
be partial or
delivery-status.
Note that this provides only an initial hint to
sendmail. The rfc822 subtype can
itself contain MIME information that might require
8- to 7-bit encoding.
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