If th eF=3
flag (?§20.8.5 on page 763) is set for a selected delivery agent, the characters:
! " # $ @ \ [ ] ^ ` { | } ~
are also converted. If F=3 is not set, those characters are output as is.
Lines longer than 72 characters (bytes) are broken with the insertion of an = character and
the E= end-of-line characters defined for the current delivery agent. Any lines that end in a
whitespace character have that whitespace character converted to quoted-printable, even if
the line has fewer than 72 characters. Quoted-printable encoding is described in RFC1521.
Where m (mimefy) might not be appropriate for a given delivery agent, the F=8 flag (?§20.8.9
on page 764) can be specified to force p (pass8bit) behavior.
The EightBitMode option is safe. Even if it is specified from the command line, sendmail
retains its special privileges.
24.9.45.1 EightBitMode=mimefy
Convert unlabeled 8-bit input to BITMIME, and do any necessary conversion of BITMIME
to 7 bits. When running as a daemon receiving mail via SMTP, advertise the BITMIME
ESMTP keyword as valid. This key specifies that your site will be a MIME installation.
24.9.45.2 EightBitMode=pass
Pass unlabeled 8-bit input through as is. Convert labeled BITMIME input to 7 bits as
required by any delivery agent withth e F=7 flag set (?§20.8.8 on page 764), or any SMTP
server that does not advertise BITMIME.
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