If I do not add a port after the SMTP server, what port does Windows 10 Mail use by default, 465, 587, or 25? I checked on all the options including "Require SSL for outgoing email".
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It will try connections based upon these 3 ports, and the one that succeeds is then setup.
The default SMTP port is 25, so if no port is specified, 25 is used. If you require SSL, port 25 cannot be used, so in that case there always is a port.
465 is Secure SMTP, but 587 can be both secure and non-secure and is often used by STARTTLS, whereas 465 is often used by SSL/TLS.
LPChip
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In Windows 10 Mail app you need to setup the SMTP port for both incoming and outgoing messages:
The sync was resolved as soon as I setup :993 and :465 after the nameserver
Francesco Mantovani
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