qmail-smtpd

NAME

SYNOPSIS

DESCRIPTION

qmail-smtpd is responsible for counting hops. It rejects any message with 100 or more Received or Delivered-To header fields.

qmail-smtpd supports ESMTP, including the 8BITMIME and PIPELINING options.  

TRANSPARENCY

qmail-smtpd accepts messages that contain long lines or non-ASCII characters, even though such messages violate the SMTP protocol.  

CONTROL FILES

badmailfrom

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.

databytes

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 overrides databytes.

localiphost

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.

morercpthosts

Extra allowed RCPT domains. If rcpthosts and morercpthosts both exist, morercpthosts is effectively appended to rcpthosts.

You must run qmail-newmrh whenever morercpthosts changes.

Rule of thumb for large sites: Put your 50 most commonly used domains into rcpthosts, and the rest into morercpthosts.

rcpthosts

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 address.

rcpthosts may include wildcards:

   heaven.af.mil
   .heaven.af.mil

Envelope recipient addresses without @ signs are always allowed through.

smtpgreeting

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 host's name.

timeoutsmtpd

Number of seconds qmail-smtpd will wait for each new buffer of data from the remote SMTP client. Default: 1200.

GREYLISTING

   GREYIP=":"

Alternatively a different IP address and/or port can be specified as in these examples,

   GREYIP="192.168.1.50"
   GREYIP=":12345"
   GREYIP="192.168.1.33:54321"

Exception: If the environment variable RELAYCLIENT is set (see details on this above), greylisting does not occur.

Greylisting may be explicitly disabled by setting GREYIP to an empty string,

   GREYIP=""

Clearly greydaemon must be available to respond to greylisting queries. If the GREYIP address/port is unavailable and the system detects this - perhaps via an ICMP 'unreachable' type response - the SMTP session aborts with a temporary error when the greylisting check occurs; the errno string is logged to help troubleshooting (typically greydaemon isn't running or is blocked by firewall rules). Otherwise if there is no response a timeout occurs, producing the same temporary error but without further logging detail.

SEE ALSO

Index

NAME

SYNOPSIS

DESCRIPTION

TRANSPARENCY

CONTROL FILES

GREYLISTING

SEE ALSO