qmail-smtpd - receive mail via SMTP
qmail-smtpd receives mail messages via the Simple Mail
Transfer Protocol (SMTP) and invokes qmail-queue to deposit
them into the outgoing queue. qmail-smtpd must be supplied
several environment variables; see tcp-environ(5).
qmail-smtpd is responsible for counting hops. It rejects
any message with 100 or more Received or Delivered-To header
qmail-smtpd supports ESMTP, including the 8BITMIME and
qmail-smtpd converts the SMTP newline convention into the
UNIX newline convention by converting CR LF into LF. It
returns a temporary error and drops the connection on bare
LFs; see http://pobox.com/~djb/docs/smtplf.html.
qmail-smtpd accepts messages that contain long lines or
non-ASCII characters, even though such messages violate the
Unacceptable envelope sender addresses. qmail-smtpd
will reject every recipient address for a message if
the envelope sender address is listed in badmailfrom.
A line in badmailfrom may be of the form @host, meaning
every address at host.
Maximum number of bytes allowed in a message, or 0 for
no limit. Default: 0. If a message exceeds this
limit, qmail-smtpd returns a permanent error code to
the client; in contrast, if the disk is full or qmail-
smtpd hits a resource limit, qmail-smtpd returns a
temporary error code.
databytes counts bytes as stored on disk, not as
transmitted through the network. It does not count the
qmail-smtpd Received line, the qmail-queue Received
line, or the envelope.
If the environment variable DATABYTES is set, it
Replacement host name for local IP addresses. Default:
me, if that is supplied. qmail-smtpd is responsible
for recognizing dotted-decimal addresses for the
current host. When it sees a recipient address of the
form box@[d.d.d.d], where d.d.d.d is a local IP
address, it replaces [d.d.d.d] with localiphost. This
is done before rcpthosts.
Extra allowed RCPT domains. If rcpthosts and
morercpthosts both exist, morercpthosts is effectively
appended to rcpthosts.
You must run qmail-newmrh whenever morercpthosts
Rule of thumb for large sites: Put your 50 most
commonly used domains into rcpthosts, and the rest into
Allowed RCPT domains. If rcpthosts is supplied,
qmail-smtpd will reject any envelope recipient address
with a domain not listed in rcpthosts.
Exception: If the environment variable RELAYCLIENT is
set, qmail-smtpd will ignore rcpthosts, and will append
the value of RELAYCLIENT to each incoming recipient
rcpthosts may include wildcards:
Envelope recipient addresses without @ signs are always
SMTP greeting message. Default: me, if that is
supplied; otherwise qmail-smtpd will refuse to run.
The first word of smtpgreeting should be the current
Number of seconds qmail-smtpd will wait for each new
buffer of data from the remote SMTP client. Default:
tcp-env(1), tcp-environ(5), qmail-control(5), qmail-
inject(8), qmail-newmrh(8), qmail-queue(8), qmail-remote(8)
Man(1) output converted with