** mailer flags for sendmail 8.X **
a	run Extended SMTP protocol
b	ensure blank line at end of message
c	don't include comment part of address
C	make addresses canonical "u@dom"
D	CF: include Date:
e	it costs to use this mailer....
E	escape From lines to >From
f	mailer takes picky -f flag
F	CF: include From: or Resent-From:
g	sender of errors should be $g
h	preserve host case distinction
H	MAIL11V3: preview headers
I	SMTP to another sendmail site
l	delivery is to this host
L	must enforce SMTP line limits
m	can handle multiple users at once
M	CF: include Message-Id:
n	don't insert From line
N	MAIL11V3: DATA returns multi-status
p	use reverse-path in MAIL FROM:
P	CF: include Return-Path:
r	mailer takes picky -r flag
R	try to send on a reserved TCP port
s	strip quote chars from user/host
S	must be daemon to execute
u	preserve user case distinction
U	this wants an ugly UUCP from line
V	UIUC: !-relativize all addresses
x	CF: include Full-Name:
X	use hidden-dot algorithm
7	use 7-bit path


** mailer flags for sendmail 5.X **
C	make addresses canonical "u@dom"
D	CF: include Date:
e	it costs to use this mailer....
E	escape From lines to >From
f	mailer takes picky -f flag
F	CF: include From: or Resent-From:
h	preserve host case distinction
I	SMTP to another sendmail site
l	delivery is to this host
L	must enforce SMTP line limits
m	can handle multiple users at once
M	CF: include Message-Id:
n	don't insert From line
p	use reverse-path in MAIL FROM:
P	CF: include Return-Path:
r	mailer takes picky -r flag
R	try to send on a reserved TCP port
s	strip quote chars from user/host
S	must be daemon to execute
u	preserve user case distinction
U	this wants an ugly UUCP from line
x	CF: include Full-Name:
X	use hidden-dot algorithm
