Multiple and snagged posting issue

Good afternoon again!

Last Friday I made an automated blog, and it posted fine: except that we had multiple postings. Many people including myself on home email received it three times ( e..g myself on home email: Friday 2252, Sat 0552 and Sat 0852). Also it seemed to get jammed in our server system (as reported by our website hosts).
So there are two situations to solve;
1) Why did it go out 3 times?
2) Why did it get jammed in our out-system?

Regarding (1) I hope you can investigate. My only guess is that it is picking up emails from several lists, and then not filtering out duplicates.
Regarding (2) , our system is set by the website hosts to cope with a maximum email rate of 250 emails per 30 minutes. The reason is that emails going out more quickly than this tend to be regarded as spam. I wonder if Easyblog is streaming them out too quickly for our servers system? With Acymailing, we can slow down the rate of emails, but I don't see how to do this with Easyblog.

Thanks, Robin