For the server I am trying to connect, I was told to use 587 if 25 didn't work, so I've been trying both.
You should use 587.
Here is the smtpd.conf now:
Looks good. I bet money that the username:password pair in <secrets> is just wrong :-) Don't forget to run # smtpctl update table secrets after you edit /etc/mail/secrets -- You received this mail because you are subscribed to misc@opensmtpd.org To unsubscribe, send a mail to: misc+unsubscr...@opensmtpd.org