Hi Rachael - I have 2 systems that send out thousands of emails with PDF attachments every day.

Chilkat handles this easily - though I've found that with Crystal Reports creating the PDFs I need a 30 second delay to make sure the file is written to disk before sending the email. With DataFlex Reports, I need a 2 minute lag. I don;t believe this is an email issue, but one of the tools creating the PDFs & Windows "catching up" to the PDF's creation.

Because Chilkat requires the DLL to be installed on each machine sending emails, I have a 2 step system so that it's only installed on one server: the app creates a record in a table & then there is a standalone app running as a service that simply checks the email table for any new records & when it finds one, it attaches the PDF & sends the email.