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?