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MailChimp sent 3 billion emails last month

MailChimp sent 3 billion emails last month.

Matthew from MailChimp unveils the secret of ‘Cold IPs’ and how MailChimp manages to push half a million emails over an IP all at once.

The problem is that cold IPs don’t have any reputation. Email receivers like Gmail and Hotmail would probably bounce all that traffic.

Read more about  IP + Volume = Reputation at MailChimp.