.TH qmail-smtpd 8.SH NAMEqmail-smtpd \- receive mail via SMTP.SH SYNOPSIS.B qmail-smtpd.SH DESCRIPTION.B qmail-smtpdreceives mail messages via the Simple Mail Transfer Protocol (SMTP)and invokes.B qmail-queueto deposit them into the outgoing queue..B qmail-smtpdmust be supplied several environment variables;see.BR tcp-environ(5) ..B qmail-smtpdis responsible for counting hops.It rejects any message with 100 or more .B Receivedor.B Delivered-Toheader fields..B qmail-smtpdsupports ESMTP, including the 8BITMIME and PIPELINING options..SH TRANSPARENCY.B qmail-smtpdconverts the SMTP newline convention into the UNIX newline conventionby converting CR LF into LF.It returns a temporary error and drops the connection on bare LFs;see.BR http://pobox.com/~djb/docs/smtplf.html ..B qmail-smtpdaccepts messages that contain long lines or non-ASCII characters,even though such messages violate the SMTP protocol..SH "CONTROL FILES".TP 5.I badmailfromUnacceptable envelope sender addresses..B qmail-smtpdwill reject every recipient address for a messageif the envelope sender address is listed in.IR badmailfrom .A line in.I badmailfrommay be of the form.BR @\fIhost ,meaning every address at.IR host ..TP 5.I databytesMaximum number of bytes allowed in a message,or 0 for no limit.Default: 0.If a message exceeds this limit,.B qmail-smtpdreturns a permanent error code to the client;in contrast, ifthe disk is full or.B qmail-smtpdhits a resource limit,.B qmail-smtpdreturns a temporary error code..I databytescounts bytes as stored on disk, not as transmitted through the network.It does not count the.B qmail-smtpdReceived line, the.B qmail-queueReceived line, or the envelope.If the environment variable.B DATABYTESis set, it overrides.IR databytes ..TP 5.I localiphostReplacement host name for local IP addresses.Default:.IR me ,if that is supplied..B qmail-smtpdis responsible for recognizing dotted-decimal addresses for thecurrent host.When it sees a recipient address of the form.IR box@[d.d.d.d] ,where.I d.d.d.dis a local IP address,it replaces.IR [d.d.d.d]with.IR localiphost .This is done before.IR rcpthosts ..TP 5.I morercpthostsExtra allowed RCPT domains.If.I rcpthostsand.I morercpthostsboth exist,.I morercpthostsis effectively appended to.IR rcpthosts .You must run.B qmail-newmrhwhenever.I morercpthostschanges.Rule of thumb for large sites:Put your 50 most commonly used domains into.IR rcpthosts ,and the rest into.IR morercpthosts ..TP 5.I rcpthostsAllowed RCPT domains.If.I rcpthostsis supplied,.B qmail-smtpdwill rejectany envelope recipient address with a domain not listed in.IR rcpthosts .Exception:If the environment variable.B RELAYCLIENTis set,.B qmail-smtpdwill ignore.IR rcpthosts ,and will append the value of.B RELAYCLIENTto each incoming recipient address..I rcpthostsmay include wildcards:.EX   heaven.af.mil   .heaven.af.mil.EEEnvelope recipient addresses without @ signs arealways allowed through..TP 5.I smtpgreetingSMTP greeting message.Default:.IR me ,if that is supplied;otherwise.B qmail-smtpdwill refuse to run.The first word of.I smtpgreetingshould be the current host's name..TP 5.I timeoutsmtpdNumber of seconds.B qmail-smtpdwill wait for each new buffer of data from the remote SMTP client.Default: 1200..SH "SEE ALSO"tcp-env(1),tcp-environ(5),qmail-control(5),qmail-inject(8),qmail-newmrh(8),qmail-queue(8),qmail-remote(8)