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   Good ${greeting_time}, Andrew!   
      
   10 Oct 2021 01:17:34, you wrote to Brian Rogers:   
      
    BR>> I have Comcast as well, however they filter the same ports on IPv6   
    BR>> as they do on IPv4 such as 25, 80, etc. I see you're running under   
    BR>> the Comcast native IPv6 - did they open the ports for you or are you   
    BR>> lucky and they just haven't hit your block yet? I ended up using   
    BR>> HE.net with a 6 to 4 tunnel which bypasses the Comcast blocks.   
    AL> The filter on port 25 is easy to work around, and prevents a lot of   
    AL> spam entering the internet.   
      
   Properly configured mail servers do accept incoming messages only from other   
   servers (they act in completely different manner than hijacked hosts) or from   
   authenticated users (having a certificate or at least an username+password).   
      
    AL> They do not filter port 80 for me.   
      
   Having 80/tcp filtered out is not a big problem: you always have an option to   
   use HTTPS instead of plain HTTP (issuing a self-signed certificate is trivial,   
   and the encryption overhead is minimal; however, SSL/TLS is unsafe).   
      
   The reanon for ISPs to filter out incoming (to user) HTTP and outgoing (from   
   user) SMTP is trivial: first is used to access improperly configured routers,   
   and second is used to send spam - both increasing the load on the abuse desk.   
      
    AL> (http://phoenix.bnbbbs.net works fine.) They have a list of blocked   
    AL> ports on their website at   
    AL> https://www.xfinity.com/support/articles/list-of-blocked-ports ...   
      
   Ok, at least users know in advance what they would get for their money.   
      
      
   --   
   Alexey V. Vissarionov aka Gremlin from Kremlin   
   gremlin.ru!gremlin; +vii-cmiii-ccxxix-lxxix-xlii   
      
   ... :wq!   
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