Since this software is so old.
It could be your host has changed or upgraded the mail server over time. And the email feature has stopped working.
I recall that in this version you could select one of either sendmail or SMTP.
Possible you were using one option say smtp and it was turned off and now you need to use sendmail. Or vice versa.
I would get with the admin and test the email feature because you may need to contact the host to determine what you have now and what the mail path or server is now.
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Blue Man Group