Thanks! It works!
But it only sends 128 emails and then fails.

Could you let me know please, because I don't really have a way to check it myself:
How much time do I need to wait between 128 email-sends to the next 128?
And If I send same email message to many addressees, is there a limit on the number of addressees?
What is the "right" way to send multiple emails?

It is a library application. (Library - aka books lending library - check in check out application.) We need the application to send emails to all members who are late in returning books. Ideally, we want the list of specific books to be enumerated in the email. Which means different text for each member. But, in case it is much easier to send uniform text to all members who are late, we will consider that. If you can answer the above Qs, we will be able to make the wise decision.

Thank you very much!
Tova