You can have a working TCP/IP configuration with successful implementation of most TCP/IP functions (telnet, rlogin, ftp, and rcp) between the local machine and a remote machine, but the /usr/mmdf/chans/smtp program may be unable to establish a connection with the remote site.
You may see an error message like this in /usr/mmdf/log/chan.log when you attempt to send mail to the remote site if you have the logging level set to Every diagnostic possible (FTR in the mmdftailor(F) file):
trying 18.104.22.168 can't get connection (115) [SYSERR(115) connection refused] a3000.your_company.com(59000003) no open sm_gethostid (a3000.your_company.COM) tb_k2val (smtp.chn, first=0, a3000.your_company.COM) tb_k2val failed qu_wrply() (DHST) 'Remote host unavailable' qu_wrec() (15) "Remote host unavailable" qu_radr qu_rrec () (4) "aend" qu_wrply() (DHST) 'no valid addresses' qu_wrec() (51) "no valid addresses" qu_mend hd_end () qu_pkend wend qu_endWhen inetd(ADMN) is started it reads /etc/inetd.conf and /etc/services. It then creates a socket for each server and binds each socket to the port for that server.
inetd listens on multiple ports for incoming connection requests. When it receives a request it spawns the appropriate server.
The above error message indicates that the local smtp program
did not establish a socket connection.
This means that the
inetd process on the remote machine did
not open a socket for smtp at port 25
because the smtp entry was
omitted in /etc/inetd.conf and /etc/services.
To resolve the problem:
smtp stream tcp nowait mmdf /usr/mmdf/chans/smtpd smtpd /usr/mmdf/chans/smtpsrvr smtp
smtp 25/tcp mailThe line in /etc/services consists of service name, port number and protocol type (separated by /), and an optional alias name.
ps -ef | grep inetdIf you see an output similar to this:
root 257 1 0 May 11 ? 0:01 inetdthen kill inetd by entering:
kill -1 257Where 257 is the process id.
If the remote machine (to which mail is being directed) is not an SCO OpenServer system, see the appropriate documentation for your system.