How to get mail working

I have my DNS records set up for each domain for mail/webmail, including ssl.

Every time I launch webmail.domain, I get the “Opps Something went wrong” error page.
I have done this with 2 domains and none of them work. What am I doing wrong?

That was a quick response, let me check out the link and get back with an update.

Okay, this command worked:
find /etc/roundcube/ -type f -iname “*php” -exec chmod 644 {} ;

Now, I just need ITFlow to use the smtp feature to send emails.

I cannot receive emails from google…outlook works fine