The mconnect utility opens a connection to the mail server on a given host, so that it can be tested independently of all other mail software. If no host is given, the connection is made to the local host. Servers expect to speak the Simple Mail Transfer Protocol (SMTP) on this connection. Exit by typing the quit command. Typing EOF sends an end of file to the server. An interrupt closes the connection immediately and exits.

The following options are supported:

-p port

Specify the port number instead of the default SMTP port (number 25) as the next argument.

-r

"Raw" mode: disable the default line buffering and input handling. This produces an effect similar to telnet(1) to port number 25.

The following operand is supported:

hostname

The name of a given host.

The mconnect command is IPv6-enabled. See ip6(7P).

/etc/mail/sendmail.hf

help file for SMTP commands

See attributes(5) for descriptions of the following attributes:

telnet(1), sendmail(1M), attributes(5), ip6(7P)

Postel, Jonathan B., RFC 821, Simple Mail Transfer Protocol, Information Sciences Institute, University of Southern California, August 1982.