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Mass Email Notification to 1Mn Contacts

We have a customer with more than a Million contacts in the database. There is a change in how contact details are now going to be managed and hence an email needs to be legally sent to all the contacts. What is the best way to do this without harming the IP reputation?
Answers
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Hi,
You should bach send into smaller batches along several days across the maximum nunber of hours available. Instead of sending them all Monday an 1 PM do a Monday to Friday send, 5 days, with 8h of sending timeframe along each day. If you can stretch it to two weeks, even better. Segment the recently active contacts(6months, up to 1year) for the first sends.
The option is underSending Options tab of the canvas email box.
Make sure to master exclude hard bounces and maybe even soft ones.
I hope this helps,
Codrin Teiu
Logarithmic Solutions