Sending out a LOT of mail all at once

Sending out a LOT of mail all at once

Hi,

I am an author and send out articles to regional parenting magazines (who will publish multiple submitted material). I have the addresses divided into 15 categories so I can send the articles in 15 batches. But I just got the :554 5.1.8 blocked message.

Is there a better way for me to send to these magazines instead of what I'm doing?

:)  Jan