XPost: alt.comp.software.thunderbird   
   From: toylet.toylet@gmail.com   
      
   On 2/23/2026 3:39 PM, R.Wieser wrote:   
   >   
   > The ISPs don't block those ports (25 is just one of them), they are just not   
   > connected to their email server/service anymore.  Instead they have opened   
   > up the SSL variants of them.   And for a good reason.   
      
   ISPs are trying to prevent non-business customers from running their own   
   SMTP server (TCP port 25) to spam the world.   
      
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