Take a look at the Send Mail script step.
Questions that spring to mind...
Windows or Mac?
Version of Filemaker?
Number of emails to send?
Conditional email formatting or a generic email to multiple reciepants?
Sending how often? Once?
Does your email provider allow that many emails at a time?
Are simple text emails adequate?
HTML emails are pretty easy to send with the online promotion services...
Just to add a couple observations from FMP9. I created a little runtime to do a single email to a group. I created/developed on Mac. Testing it running FMP9, I had 10 email addresses. It quickly and smoothly sent them all out. I opened on XP to bind. When I copied it to XP at work, we loaded 499 names/email addresses. Clicking send, it started to go through Exchange Server using Outlook. We had to confirm each of the 499 that a "virus" was not taking control of the email.
Would using FMPA10's option for SMTP email eliminate that problem? Or will it happen again. I want to re-do my applet to do more email blast to our vendor groups. But instead of working with 499, I will have about 3500 addresses to send emails to.