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I'm looking to send mail using the WP Mail SMTP plugin through Google's services because:
Is there a way to make these work together? Or another suggested SMTP mail provider?
WP Mail SMTP is nice because I can OAuth sign-in with my google provider giving me those better limits.
WP Mail SMTP actually just uses a mail service (in your case, sounds like gmail).
You can configure CiviCRM to use the same service using SMTP. I did a quick search on WP Mail SMTP and it does not appear to provide an API - which is likely a way to connect CiviCRM to it.
While this may seem more secure to you for whichever reasons, you want the least complex process map to each activity. In this case sending mail.
Using CivCRMs mailer your map is:
User interacts with Civi, Civi triggers mail service, Mail service interacts with Gmail
Using WP Mail SMTP, the map becomes:
User interacts with Civi, Civi triggers some link to WP Mail SMTP, WP Mail SMTP triggers mail service, Mail service interacts with Gmail
Your surface map has an extra vector for attackers to leverage.
I would recommend against using that, however if you do wish to, I would further recommend contacting some developer groups and try to hire someone to write an extension.
Within CiviCRM community, there is a partner CiviSMTP that specializes in email and more than likely, talking to them will get you to the best solution.
Good luck!
