qmail-remote - send mail via SMTP
qmail-remote host sender recip
[ recip ...
reads a mail message from its input and sends the message to
one or more recipients at a remote host.
The remote host is qmail-remote
's first argument, host
sends the message to host
, or to a mail exchanger
listed in the Domain Name System, via the Simple Mail Transfer
Protocol (SMTP). host
can be either a fully-qualified domain name:
or an IP address enclosed in brackets:
The envelope recipient addresses are listed as recip
. The envelope sender address is listed as sender.
Note that qmail-remote
does not take options and does not follow the
End-of-file in SMTP is encoded as dot CR LF. A dot at the beginning of a line is
encoded as dot dot. It is impossible in SMTP to send a message that does not
end with a newline. qmail-remote
converts the UNIX newline convention
into the SMTP newline convention by inserting CR before each LF.
It is a violation of the SMTP protocol to send a message that contains long
lines or non-ASCII characters. However, qmail-remote
will happily send
such messages. It is the user's responsibility to avoid generating illegal
prints some number of recipient reports,
a message report.
Each report is terminated by a 0 byte. Each report
begins with a single letter:
- Recipient report: acceptance.
- Recipient report: permanent rejection.
- Recipient report: temporary rejection.
- Message report: success. host has taken responsibility for
delivering the message to each acceptable recipient.
- Message report: temporary failure.
- Message report: permanent failure.
After this letter comes a human-readable description of what happened.
The recipient reports will always be printed in the same order as
arguments. Note that in failure cases there
may be fewer recipient reports than recip
always exits zero.
- Current host name, for use solely in saying hello to the remote SMTP
server. Default: me, if that is supplied; otherwise
qmail-remote refuses to run.
- Artificial SMTP routes. Each route has the form
domain:relay, without any extra spaces.
If domain matches host, qmail-remote will
connect to relay, as if host had relay as its only
MX. (It will also avoid doing any CNAME lookups on recip.)
host may include a colon and a port number to use instead of the
normal SMTP port, 25:
relay may be empty; this tells qmail-remote to look up MX
records as usual. smtproutes may include wildcards:
Here any address ending with .af.mil (but not af.mil itself)
is routed by its MX records; any other address is artificially routed to
The qmail system does not protect you if you create an artificial
mail loop between machines. However, you are always safe using
smtproutes if you do not accept mail from the network.
- Number of seconds qmail-remote will wait for the remote SMTP server
to accept a connection. Default: 60. The kernel normally imposes a
75-second upper limit.
- Number of seconds qmail-remote will wait for each response from the
remote SMTP server. Default: 1200.
addresses(5), envelopes(5), qmail-control(5), qmail-send(8), qmail-smtpd(8),