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Successfully delivering email to my clients is a pretty high priority at my company. We are of course fully opt-in, paid clients, no possibility of spam, the whole thing. The information we email is specifically requested from us by the recipient.
We have done some of the easy stuff like setting up SPF records on our outgoing mail servers.
What other steps can we take to ensure that our email goes through, in terms of email server setup and configuration ( similar to SPF, etc )
Alternatively, are there 3rd party email services that we can pay for that already manage these issues?