From the Mandril site, they may require a MailChimp plan of $25.00/month
for
1,501-2000 subscribers. I'm not sure what a "subscriber" is in this
scenario but it's
definitely worth looking into before signing up.
I'm vaguely familiar with MailChimp as a service for shooting posts to a mailing list. So it works for breweries who want to send out newsletters, but I don't how it would be for sending out individual invoices or to people who aren't signed up to receive.
-Jerry
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