Hello,
I noticed that many Exchange Servers nowadays have problems with TLS. Is
there a way to make a fallback to plain if there is a timeout on MAIL
FROM? I currently use smtp_tls_security_level=may
I found some 100's domains on different IPs which have this problems
right now, here is a example server:
15F5450139E: to=<x...@kindersleytransport.com>,
relay=mail.kindersleytransport.com[207.195.36.62]:25, delay=244097,
delays=244096/0/1.1/0.16, dsn=4.4.2, status=deferred (lost connection
with mail.kindersleytransport.com[207.195.36.62] while sending MAIL FROM)
I can also verify this when i do a "openssl s_client -starttls smtp
-connect mail.kindersleytransport.com:25 -debug"
the TLS initiation works but when you enter MAIL FROM: t...@example.com
you will get an timeout.
When using just a simple telnet without TLS, sending mails will work fine!
all this servers are showing the same (old?) version: "Microsoft ESMTP
MAIL Service, Version: 6.0.3790.4675"
Maybe there is a way to disable STARTTLS when this prompt is shown?
Best regards
Matthias Schneider
