IMPORTANT: how to ensure perfect deliverability

If you're using our Marketing add-on to send mass emailing campaigns, you should also add our partner's IP addresses to your SPF.

@ 3600 IN TXT "v=spf1 a ip4:54.36.191.102 ip4:54.36.221.72/30 ~all"

and of course, it's SPF2 version:

@ 3600 IN TXT "v=spf2.0/pra ip4:54.36.191.102 ip4:54.36.221.72/30 ~all"

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