Store not sending mail

I've installed Zen Cart. While in Admin, I'm trying to edit the e-mail as no e-mail is being sent from the store. I'm not receiving invoices and it's not even sending the welcome e-mails to new customers.

When I try to edit the e-mail, I'm seeing this error at the top and can't go any further with editing.
Anyone know what I can do to fix this?

Fatal error: Call to undefined function: zencfg_select_option() in /home/thescrap/public_html/store/admin/configuration.php(192) : eval()'d code on line 1

Based on the error message you're reporting, I'm guessing that you:

1. manually edited a database-export file via a search-and-replace for "zen_" to "zen", or otherwise
2. did a database-import using that file, probably for an upgrade from an older version

Unfortunately, "zen_" is used in many other places other than just table names.
You cannot safely do a search/replace of "zen_" for the content of at least the "configuration" and "product_type_layout" tables.

You'll need to redo your process, or manually edit each entry in your configuration table to restore the function names coded there.