Sendmail Installation and Operation Guide
SMM:08-75
The default file is "/etc/mail/service.switch".
SevenBitInput
[7] Strip input to seven bits for compatibility with old systems. This shouldn't be
necessary.
SingleLineFromHeader
[no short name] If set, From: lines that have embedded newlines are unwrapped
onto one line. This is to get around a botch in Lotus Notes that apparently cannot
understand legally wrapped RFC 822 headers.
SingleThreadDelivery
[no short name] If set, a client machine will never try to open two SMTP connec-
tions to a single server machine at the same time, even in different processes.
That is, if another sendmail is already talking to some host a new sendmail will
not open another connection. This property is of mixed value; although this
reduces the load on the other machine, it can cause mail to be delayed (for exam-
ple, if one sendmail is delivering a huge message, other sendmails won't be able
to send even small messages). Also, it requires another file descriptor (for the
lock file) per connection, so you may have to reduce the ConnectionCacheSize
option to avoid running out of per-process file descriptors. Requires the HostSta-
tusDirectory
option.
SmtpGreetingMessage=message
[$e macro] The message printed when the SMTP server starts up. Defaults to "$j
Sendmail $v ready at $b".
StatusFile=file
[S] Log summary statistics in the named file. If no file name is specified, "statis-
tics" is used. If not set, no summary statistics are saved. This file does not grow
in size. It can be printed using the mailstats(8) program.
SuperSafe
[s] This option can be set to True, False, Interactive, or PostMilter. If set to True,
sendmail will be super-safe when running things, i.e., always instantiate the queue
file, even if you are going to attempt immediate delivery. Sendmail always instan-
tiates the queue file before returning control to the client under any circumstances.
This should really always be set to True. The Interactive value has been intro-
duced in 8.12 and can be used together with DeliveryMode=i. It skips some syn-
chronization calls which are effectively doubled in the code execution path for
this mode. If set to PostMilter, sendmail defers synchronizing the queue file until
any milters have signaled acceptance of the message. PostMilter is useful only
when sendmail is running as an SMTP server; in all other situations it acts the
same as True.
TLSSrvOptions [no short name] List of options for SMTP STARTTLS for the server consisting of
single characters with intervening white space or commas. The flag ``V'' disables
client verification, and hence it is not possible to use a client certificate for relay-
ing. Currently there are no other flags available.
TempFileMode=mode
[F] The file mode for transcript files, files to which sendmail delivers directly, files
in the HostStatusDirectory, and StatusFile. It is interpreted in octal by default.
Defaults to 0600.
Timeout.type= timeout
[r; subsumes old T option as well] Set timeout values. For more information, see
section 4.1.
TimeZoneSpec=tzinfo
[t] Set the local time zone info to tzinfo -- for example, "PST8PDT". Actually, if
this is not set, the TZ environment variable is cleared (so the system default is