09-09-2017
Hi,
OK, thanks - it would be interesting to know exactly why this didn't work, and what precisely caused the mail delivery to fail, which we'll hopefully get clues about from your mail logs.
One thing I'm not 100% clear on is why you actually need a smart relay here. Ultimately, barring there being networking restrictions in place that prevent your host communicating over SMTP with the outside world, there's nothing a dedicated smart relay box can do that your own local Sendmail install can't. Unless as I say something is configured on your network to stop your own dev box sending mail to the Internet, then it shoud be perfectly capable of delivering e-mail via SMTP to any host without needing a relay.
Of course, other hosts may well still reject that mail for a variety of reasons (e.g. they think it resembles spam, your IP/network range has a poor reputation, your reverse DNS doesn't match your forward DNS, you've gotten yourself listed on an RBL like Spamhaus, etc, etc). So if that's the reason you need a smart host - your own dev box is being rejected by other Internet hosts - then you'd need a smart host on your network that had none of the problems of your dev box, which might actually be hard to do.
Do you have a corporate SMTP gateway or mail server that deals with the normal incoming and outgoing e-mail for your whole site ? If so, can you maybe configure your smart relay to be that host instead. I imagine that somewhere locally you already have a host that handles routine e-mail functionality, and it might well be capable of acting as a smart relay in that case (though it will probably need to be configured to allow the IP of your dev box to relay through it).
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System Administration Commands etrn(8)
NAME
etrn - start mail queue run
SYNOPSIS
etrn [-v] server-host [client-hosts]
DESCRIPTION
SMTP's ETRN command allows an SMTP client and server to
interact, giving the server an opportunity to start the pro
cessing of its queues for messages to go to a given host.
This is meant to be used in start-up conditions, as well as
for mail nodes that have transient connections to their ser
vice providers.
The etrn utility initiates an SMTP session with the host
server-host and sends one or more ETRN commands as follows:
If no client-hosts are specified, etrn looks up every host
name for which sendmail(1M) accepts email and, for each
name, sends an ETRN command with that name as the argument.
If any client-hosts are specified, etrn uses each of these
as arguments for successive ETRN commands.
OPTIONS
The following option is supported:
-v The normal mode of operation for etrn is to do all of
its work silently. The -v option makes it verbose,
which causes etrn to display its conversations with
the remote SMTP server.
ENVIRONMENT
No environment variables are used.
FILES
/etc/mail/sendmail.cf sendmail configuration file
SEE ALSO
sendmail(1M), RFC 1985.
CAVEATS
Not all SMTP servers support ETRN.
CREDITS
Leveraged from David Muir Sharnoff's expn.pl script. Chris
tian von Roques added support for args and fixed a couple of
bugs.
AVAILABILITY
The latest version of etrn is available in the contrib
directory of the sendmail distribution through anonymous ftp
at ftp://ftp.sendmail.org/ucb/src/sendmail/.
AUTHOR
John T. Beck <john@beck.org>