We are looking for advice on a proper SPF record. Our current record is as follows:
V=spf1 mx ~all
But after doing some research, it seems that we should have a different setup like this:
v=spf1 mx a ip4:xx.xx.xx.xx include:mailchimp.com ?all
1) ip4:xx.xx.xx.xx = our mail server external address
2) include:mailchimp.com = mailchimp sends marketing emails on our behalf, but through their system, not ours
We have used a few of the online SPF creation tools, but all this seemed to have done is confuse us more. We want to make sure that our emails are received without issue on other systems, but don't want to open things up too much - especially with the mailchimp service. Any advice/explanation would greatly be appreciated.