I had similiar problems and had to buy a dedicated Mail Server (IMAIL is
recommened, from IPSWITCH).
Anyow, you probarbly know CF is NOT recommended
for high-volume "MAILING LIST" like yours.

If you can't get your hands on a dedicated mail server (that
will help ALOT in performace!!) I suggested this:

1. Don't attach the file(s) using the MIMEATTACH switch
on the parent CFMAIL tag, instead, use CFMAILPARAM(s)
something like this:

<CFMAILPARAM FILE="#dir_mapt#\#filename1#">
<CFMAILPARAM FILE="#dir_mapt#\#filename2#">
<CFMAILPARAM FILE="#dir_mapt#\#filename3#">

2. Don't use the QUERY attribute with the CFMAIL
instead, try to think of using CFLOOP=QUERY (that's
not recommened too, but...) with a single CFMAIL each
time (you don't need examples for that, right?)

3. give a time interval (of about 5 minutes) between
CFLOOP and/or multiple CFMAIL recipintes list.
This will give the server "TIME TO RECOVER".

hope this tips helps,
again - I recommened a dedicated mail software that
will run on the same CF machine to handle this tasks.
I think you can get IMAIL For 900$ 1 time fee and deliver
100K messages a day without a problem on pentium 100mhz

It's MUCH BETTER.

Thanks,

Michael Lugassy
Interactive Music Ltd.
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