troubleshooting e-mail sent from a server by script

[Curtis Ford]

I've done a project for a client that involves customers filling out a 
form on a web page, which triggers a script that 1) writes their 
information to a log file on the server, and 2) sends out confirmation 
e-mails to the customer and client.

It's been working well for quite a while, but every now and then the 
e-mails aren't received - about one in 10 or 20, according to the 
client. When I test, everything seems fine.

Any ideas on what could cause this, or how to troubleshoot it? The host 
is Jaguar PC, and we're using an old version of the Linux engine.

Thanks!

Curt
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