If your email domain is hosted by one of these providers, you can enable DKIM authentication by following the instructions in the provide links. This is a non-exhaustive list so you should inquire with your mail provider if it’s not listed here. Setting up DKIM and associated email security protocols SPF and DMARC require updates to the DNS records of your sending domain.
- Google-Gmail (default Google DKIM on custom domains is insufficient)
- Microsoft – Office365
- Yahoo Small Business: