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I already suggested you the right way to manage your newsletter.

Anyway, as you know, the limit is "3 emails every 2 seconds". You can try to put your recipes in the BCC field (or in the TO field)...

It should work.

We know the Altervista newsletter service isn't that good and I will suggest you to try some external service to send your newsletter (something like MailChimp). They usually have a better users...