It's been for long time that tool for "send email" is semi broken
I spend like 1h to trying to figure out why I cannot send email via mikrotik OS, been adding certs, tweaking ports, checking log message on mail server...
and end up testing the email capability with CLI with success.
`Email setting` windows has STARTTLS option: NO, YES, TLS ONLY, CLI has TLS parametr that has = YES, NO, STARTTLS, the `Send mail` window only has: TLS = YES, NO
So I was unable to test smtp settings with `Send mail` window because my mail server only allow for STARTTLS connection - yes, I could change that but thanks to that I nottice that those options are incosistance.