?: Technical Support <support@communigate.com>
??: Re: Rejected by blah.blah.blah.outlook.com
??: Sat, 27 May 2017 11:13:03 +0300
?: CommuniGate Pro Discussions <CGatePro@mail.stalker.com>

On 2017-05-25 20:17 , James Moe wrote:
On 05/23/2017 11:50 AM, James Moe wrote:

   We recently added "--SMTPOutgoingTLSVersion 3" to cgpro's command
line, to encourage use of TLS 1.2.
   Is that a mistake?

   Wow, tough one.
   Yes, it was a mistake. After removing the option, the "Undeliverable"
messages were delivered.

Some TLS 1.2 implementations including that of outlook.com require TLS extension that is marked as optional in the RFC. So CGPro did not advertise it (though supported) - this is addressed for 6.1.17 / 6.2c4.

Best regards,
Dmitry Akindinov.
When answering to letters sent to you by the tech.support staff, make
sure the original message you have received is included into your
??(FEED) ??(DIGEST) ??(INDEX) ??? ?? Listmaster