Thank you, I uploaded that file.
I get this message: Error: SMTP settings on the admin's Settings page missing.
I put in my username and password for my organization, it showed me a window to send a test message, but got this error:
C: From Client to SMTP server, S: Reply from SMTP server
C: Connect to socket (Server: smtp.MySite.org Port: 25) (Expected reply: 220)
S: 220 Appphsx10ht1.MySite.org Microsoft ESMTP MAIL Service ready at Wed, 8 Apr 2020 13:22:07 -0400
C: EHLO MySite.org:443 (Expected reply: 250)
S: 501 5.5.4 Invalid domain name
EHLO: SMTP server reply: 501 5.5.4 Invalid domain name
It's a private server as far as I know both PHP and SMTP should send mail. The odd thing is I didn't even notice when it stopped working. There have not been ant changes to the server environment.