I have sent emails using the Send Mail script step using both the SMTP option and my email client. I have had no problems once I correctly configured the SMTP and other settings except for the quantity limitations of the ISP server. I have never run into the Compact Mail dialogue I guess because I don't use Outlook Express.
In past comments, I have also mentioned inserting a pause when sending emails using either method since Filemaker has the capability of sending them faster than either your email client or your ISP possibly can handle. A slight pause sometimes seems to help especially when sending a large number of them.
Please understand that Filemaker does not have a server of its own. The SMTP option is Filemaker's new ability for bypassing your email client software and going directly to your ISP host server.
How many emails are you trying to send at one time?
Thanks for that, I see what you're saying, my ISP has a limit of 100 emails at a go, so I suppose this is what's tripping up filemaker. However, sending using the Outlook Express caused no ISP limit problems, does this mean that because Outlook is acting as the server, the ISP server detects this and lets it continue, as I sent 550 emails last night?
I suspect it's possible that Outlook could be using a different server than your connection host. On the Mac side, if I use Mac Mail it connect with Apple as its server host. When I use the SMTP option with Filemaker, I use my internet cable server, Cox. Apple had limited me to 100 emails per a 24-hour period. Cox is 500 or more especially with a business connection.