XPost: alt.comp.software.thunderbird   
   From: robin_listas@es.invalid   
      
   On 2026-02-24 22:50, Char Jackson wrote:   
   > On Tue, 24 Feb 2026 21:45:50 +0100, "Carlos E.R."   
   >  wrote:   
   >   
   >> On 2026-02-24 02:20, Char Jackson wrote:   
   >>> On Tue, 24 Feb 2026 00:13:22 +0000, Brian Gregory   
   >>>  wrote:   
   >>>   
   >>>> On 23/02/2026 13:36, Paul wrote:   
   >>>>> The protocol is blocked by the ISP DPI box. It doesn't even matter   
   >>>>> what port you attempt it on, Port 25 closes down just as easily   
   >>>>> as Port 1025, if the SMTP protocol is sniffed by the DPI box   
   >>>>> examining packet payloads.   
   >>>>>   
   >>>>> At one time, network equipment designers would not look at a payload   
   >>>>> for any reason. It was headers-only for analysis and transport. But   
   >>>>> today, the DPI box examines whole packets and nothing is sacred :-)   
   >>>>   
   >>>> I don't think this can be normal.   
   >>>> You absolutely NEED to be able to SMTP out your emails to your outgoing   
   >>>> email server.   
   >>>   
   >>> All this talk about blocking SMTP, and other types of traffic, refers   
   >>> exclusively to *inbound* traffic, meaning traffic coming *to* a   
   >>> residential or consumer location. *Outbound* traffic, to the email   
   >>> server of your choice, or to any other server of your choice, has never   
   >>> been the problem.   
   >>>   
   >>> On a related note, I haven't seen a port 25 SMTP server in many years.   
   >>> They seem to have moved to port 465 or 587, depending on the encryption   
   >>> protocol being used.   
   >>>   
   >>   
   >> <2.6> 2026-02-23T12:20:17.994661+01:00 Telcontar postfix 3120 - -    
   5FED3320F54: to=, relay=smtp.telefonic   
   .net[86.109.99.70]:25, delay=0.6, delays=0/0.01/0.25/0.34, dsn=2.0.0,   
   status=sent (250 2.0.0 Ok: queued as    
   4fKJL96Pryz16JrS)   
   >>   
   >>   
   >> And I am on a home IP address.   
   >   
   > I can't say that I've never been to Spain, but I've never been there to   
   > inspect mail servers. Thanks for the info.   
      
   To clarify, smtp.telefonica.net is my ISP, I have to send my email to   
   them on port 25. When I visit Canada, I can not send email, because Bell   
   Canada blocks port 25, and Telefónica refuses to listen on a different   
   port but 25, when I explain the problem. They should use the submission   
   port 587.   
      
   If I am connected on a different ISP, I can send to port 25 of   
   Telefónica without any trouble.   
      
   AFAIK, they don't block any port here.   
      
   --   
   Cheers, Carlos.   
   ES🇪🇸, EU🇪🇺;   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)