mail won't send
Hi, I have no problem sending emails directly from my Yahoo account.
But if I try to send a page from another website or Pinterest to someone via email or messenger using my iMac mail (which pops up to send) it won't work. It stays in the outbox of my iMac mail. It gives me a list of emails I can choose but none seem to work. iCloud used to work.
I have looked at the settings and it seems fine.
iMac 21.5", macOS 10.14