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Full Discussion: Sendmail issue
Operating Systems AIX Sendmail issue Post 302535715 by DGPickett on Friday 1st of July 2011 12:22:26 PM
Old 07-01-2011
Well, don't launch sendmail -bd, the usual mail server app. You can block a listening port with some mechanisms, like firewall SW jammed in the stack beside the NICs.

netstat -a will show any connections, but mail is a short connection protocol, like http/1.0 not persistent. lsof will tell you about every open fd on the system, including sockets. Sendmail logs somewhere, check the man page, config files.
 

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mconnect(1)							   User Commands						       mconnect(1)

NAME
mconnect - connect to SMTP mail server socket SYNOPSIS
mconnect [-p port] [-r] [hostname] DESCRIPTION
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 soft- ware. 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 immedi- ately and exits. OPTIONS
The following options are supported: -pport 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. OPERANDS
The following operand is supported: hostname The name of a given host. USAGE
The mconnect command is IPv6-enabled. See ip6(7P). FILES
/etc/mail/sendmail.hf Help file for SMTP commands ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWsndmu | +-----------------------------+-----------------------------+ SEE ALSO
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. SunOS 5.11 28 Jan 2008 mconnect(1)
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