| | One-to-One | Transactional | Bulk | |-|:----------:|:-------------:|:----:| | SPF | :heavy_check_mark: | :heavy_check_mark: | :heavy_check_mark: | | DKIM | :heavy_check_mark: | :heavy_check_mark: | :heavy_check_mark: | | DMARC | :heavy_check_mark: | :heavy_check_mark: | :heavy_check_mark: | ### Receiving - MX record - PTR of MX IP - 250-STARTTLS - [MTA-STS](https://www.mailhardener.com/tools/mta-sts-validator) - [RBLs](https://bgp.he.net/)
Receiving