El vie, 27-09-2019 a las 12:22 -0400, Viktor Dukhovni escribió:
> [...]
> 
> This makes no sense.  Portable devices use ports 587 or 465 with all
> the other providers.  And there's no "change ports constantly", they
> just use the same submission port.
> 
> Remote MTAs connect to port 25, submission clients (MUAs) connect
> to port 587.
> 

Suppose ISP imposes restrictions so the only port open either for SMTP
or submission must be TCP 25. What then?

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