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is there a way to limit amount of email per X amount of time to certain domains? for example I have large list of emails and I have thousands of emails for yahoo.com, but if I start sending them all at once yahoo will temporarily defer me thinking that I'm doing something that I'm not suppose to do, yet if I send out only 100 emails an hour they are ok with this volume, so how can I restrict sendmail to send only 100 emails an hour to yahoo.com?

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i can't believe no one ever done something like that ;( – alexus Oct 9 '09 at 14:15
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Yahoo actually limits number of mails per envelope generally above that of mails per hour. If you reduce the number of Yahoo addresses per individual mail, they will allow a lot more through per hour.

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I'm using yahoo as an example, I don't know what they rules are, most big ESPs have some sort of rule sets, so based on some tests I can adjust it and send emails quicker rather getting deferred all the time. – alexus Sep 30 '09 at 19:41
Its the same with hotmail, live, gmail etc. Once you limit the number per envelope, you can actually send quite a few more through per hour than simply leaving a mass email. Most mailing software actually has functions to take care of this already. – Ryaner Sep 30 '09 at 21:12
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