Hi Eric and list:
Thanks for the suggestion and for thinking about this. In the meantime
we figured out the problem. We've isolated the issue to a local ISP
operating under the names Netlife/Ecuanet/Telconet. All users with
issues are using this ISP. Changing the smtp port to 26 solves the
problem - which on our mailservers is prerouted and redirected to 587.
Looks like the ISP is doing something on port 587.
Weird
Jeff
On 6/8/2021 4:11 PM, Eric Broch wrote:
If you're using spamdyke it will do TLS encryption. Disable it. In
/etc/spamdyke/spamdyke.conf do the following:
# QMT does encryption/decryption when cert file is commented
#tls-certificate-file=/var/qmail/control/servercert.pem
tls-level=smtp
On 6/8/2021 12:19 PM, Jeff Koch wrote:
Hi
More info.
From some locations telnetting to port 587 on this mailserver and
then entering EHLO gets a list of services that
includes STARTTLS and from other locations STARTTLS and PIPELINING
are not shown. Any idea why that would happen?
What controls the list of services announced to email clients?
Jeff
