choice of e-mail agent for batch processing

[Matitiahu Allouche]

The following is a quite naive question, and not strictly Linux-oriented, 
so delete this mail if you find it offending.

My problem is the following: 

I need to periodically (once a month) send an e-mail message to a number 
of recipients (about a hundred).
Each message is different and will be created as a separate file by an 
application which is not of concern. The message may be plain text, but 
HTML is preferred.
Each message will also have one file attachment (the same for all 
recipients).
I don't have access to a mail server except as a regular client.
I am ready to write whatever programs are needed to put the data in proper 
format, including the HTML sugar on the plain text.
I am ready to write scripts as needed.

I am looking for a mail agent, probably working from the command line, 
which can send all my messages as a batch, or that I can invoke repeatedly 
within a script to send each message in turn.
This mail agent should be available under Linux and Windows (I know, I 
know...), should be free (as in free beer) or cost just a few dollars, 
preferably open source.

Some googling has provided the following mail-agent names which seem to 
answer my requirements:
Alpine, Gnus, Mutt, Pine, VM (View Mail)

I will appreciate any advice, either positive or negative, concerning 
those programs, or others which answer my requirements.


Shalom (Regards),  Mati
           Bidi Architect
           Globalization Center Of Competency - Bidirectional Scripts
           IBM Israel
           Phone: +972 2 5888802    Fax: +972 2 5870333    Mobile: +972 52 
2554160
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