best/easiest commandline email program for mass-email

[Alex Janssen]

I must send personalized email to our clients, about 2500.  So I figured 
on putting together each with a shell script and then sending the file 
with a commandline email program.  I was looking for suggestions on what 
might be the best package to install for this.  I have seen a suggestion 
for a program called "mail", but I can't figure out what package to 
install to get it.  I looked at the list presented by Synaptic, but 
there's a boat load of programs related to email.

If anyone has done this sort of thing, I'd sure appreciate your suggestions.

Thanks,
Alex
-Ubuntu 9.10 on several computers since version 5.04

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