Required software development freelancer for SAAS email company issue with shared DKIM AND SPF set up at scale job

We are a new SAAS start up looking to offer email marketing to our customer base. Our platform is completely built and we are currently set up via api with a 3rd part email delivery provider. We are in need of an expert that can assist us in setting up one of the following shared email domain environments for our customer base that will have the best deliverability and always successfully pass dkim and spf at scale.

Our competitors mail chimp, aweber, mad mimi and wix are each doing one of the following:

1. shared dkim and spf (aweber and mad mimi)
2. shared dkim and unique spf (mail chimp)
3. Shared spf and unique dkim (wix)

If you have experience with this and know you can help us immediately please reach out so we can discuss the project more in detail. We can provide you with examples of what our competitors are doing so that we can replicate it.

Skills & Expertise Required

software development