We have recently installed the latest version of WebWork on our network, that was recently moved entirely to the cloud on AWS (Amazon Web Server) . Everything works fine except the email feature. Every time we try to use the "Email Instructor" button we get the error message:
Failed to send message: invalid hosts in Email::Sender::Transport::SMTP constructor at /usr/share/perl5/Email/Sender/Transport/SMTP.pm line 76.
Unfortunately our ITC staff are too busy with other pressing problems and my skills as Linux system admin are entirely negligible. I looked in the file site.conf inside /opt/webwork/webwork2/conf and found the following line that seems to have been left blank:
$mail{smtpServer} = ''; # e.g. 'mail.yourschool.edu' or 'localhost'
Is that where the problem might be?
Thanks for any pointers.