Sam Varshavchik wrote:
Derrick T. Woolworth writes:
Hi all,
I have an installation of Courier that is a "bit" old, and while
talking to serveral different mail servers, I'm getting messages
like:
454 TLS not available
and then the message is deferred, forever.
I have looked at the settings in esmtp-ssl and checked to make
sure the system's certificates are readable by Courier, among many
other things, but still I can't stop this message. I have turned
off TLS completely - assuming that the mail server its talking to
would allow a non-TLS message to be delivered.
Also, I have telneted on port 25 from this mail server to the
target mail server and had no issue in delivering e-mail to the
intended recipient.
Does anyone have experience with this error or have any advice on
where I should begin to look?
Look at the moron you're sending mail to. His mail server claims
support for encrypted connection, yet when Courier calls his bluff,
it vomits all over itself. The error message you're seeing is the
remote server croaking after it's ordered to begin encryption.
And the workaround for the problem is to tell Courier not to use
encryption for those domains.
Put a line like this in your esmtproutes file:
problemdomain.com: /SECURITY=NONE
I have accumulated quite a few of these. Exchange is apparently a
frequent contributor to this problem.
Look for esmtproutes in the courier man page for more info.