$={checkMIMETextHeaders}
MIME headers for maximum arbitrary length checking V8.10 and later
Beginning with V8.10 sendmail,
the MaxMimeHeaderLength option (MaxMimeHeaderLength on page 1047) can
be used to define the maximum length for selected
MIME headers that present text descriptions. Before
making that check, sendmail
looks to see whether a particular header is in the
class $={checkMIMETextHeaders}. If it isn’t,
sendmail skips this length
check.
When V8.10 sendmail starts up, it
predefines the $={checkMIMETextHeaders} class to
contain the single MIME header Content-Description:
header (Content-Description:
on page 1153). You can add more headers with the
C or F configuration file
command.
If this header’s value is found to be too long, it is
truncated to the length specified by the MaxMimeHeaderLength
option. Note that this is a blatant truncation, and
no effort is made to keep the header legal because
it contains only random text.
Note also that you should use $={checkMIMEHeaders} ($={checkMIMEHeaders} on page 871) for RFC-format-specific
headers.
Get sendmail, 4th Edition now with the O’Reilly learning platform.
O’Reilly members experience books, live events, courses curated by job role, and more from O’Reilly and nearly 200 top publishers.
