On 19/08/2019 16.33, James Knott wrote:
On 2019-08-19 10:16 AM, Carlos E. R. wrote:
I can not use any of the submission ports. Not supported by Telefonica. It is port 25 we use.
The more I hear about them, the more I think they're incompetent. Other ISPs have blocked port 25 due to security issues. Not supporting TLS is unbelievable However, if you absolutely must use port 25, then use the hosts file or local DNS to point to their IPv4 address.
TLS is not related to this. It is supported. See my log: <2.6> 2019-08-19 16:29:46 Telcontar postfix 5421 - - 97C39320B46: removed <2.6> 2019-08-19 16:29:47 Telcontar postfix 5158 - - Anonymous TLS connection established to smtp.telefonica.net[86.109.99.70]:25: TLSv1.2 with cipher ADH-AES256-GCM-SHA384 (256/256 bits) If HE does not allow me to use port 25 to connect to my ISP, I will not connect my main computer to IPv6. Telefónica is not incompetent, they simply have a different view on this than others. Their policy, AFAIK, is not to block or interfere with their clients usage of the net. So, no blocking of ports whatsoever. And they don't suffer any security issue for this decision. -- Cheers / Saludos, Carlos E. R. (from 15.0 x86_64 at Telcontar)