On 20/09/2018 13.51, James Knott wrote:
On 09/20/2018 01:45 PM, Carlos E. R. wrote:
Well, Telefónica is apparently managing to block spam without blocking 25. For instance, by requesting authorization on connect to 25. Everybody does that, even gmail.
Not according to the instructions I just found for GMail: "Connect to smtp.gmail.com on port 465, if you're using *SSL*. (Connect on port 587 if you're using TLS.) Sign in with a Google *username* and password for authentication to connect with *SSL* or TLS."
Everything that turns up on a search for GMail configuration says the same thing.
I have been using port 25 with gmail for years. With Telefonica network: <2.6> 2018-07-15 23:19:48 Legolas postfix 892 - - Trusted TLS connection established to smtp.gmail.com[108.177.15.109]:25: TLSv1.2 with cipher ECDHE-RSA-CHACHA20-POLY1305 (256/256 bits) With Bell's network, few days ago: <2.6> 2018-09-13 02:25:03 Legolas postfix 11968 - - Trusted TLS connection established to smtp.gmail.com[173.194.208.108]:25: TLSv1.2 with cipher ECDHE-RSA-CHACHA20-POLY1305 (256/256 bits) And as you can see, it goes with TLS. And it asks my postfix for login/password. Maybe they do not recommend it, but they accept 25 just fine. I don't have here access to my log term logs to show it. And Telefónica only accepts port 25. Also with TLS. <2.6> 2018-07-15 23:12:30 Legolas postfix 32003 - - Anonymous TLS connection established to smtp.telefonica.net[86.109.99.70]:25: TLSv1.2 with cipher ADH-AES256-GCM-SHA384 (256/256 bits) <2.6> 2018-09-08 20:31:28 Legolas postfix 9925 - - Anonymous TLS connection established to smtp.telefonica.net[86.109.99.70]:25: TLSv1.2 with cipher ADH-AES256-GCM-SHA384 (256/256 bits) But not submission: <2.6> 2018-09-20 14:56:38 Legolas postfix 6958 - - connect to smtp.telefonica.net[86.109.99.70]:587: Connection timed out -- Cheers / Saludos, Carlos E. R. (from openSUSE 15.0 (Legolas))