Postmark’s help on Sender Signatures; the main way we verify sending addresses
- Adding DKIM and SPF records to Go Daddy
- What is SPF?
- How do I send email on behalf of my customers?
- What is DKIM?
- How do I add a custom return-path?
- Adding DKIM and SPF Records to DigitalOcean
- How do I verify a domain?
- How can I update SPF when a record already exists?
- Resources for adding DKIM and SPF records to DNS for common hosts and DNS providers
- How do I set up DKIM for Postmark?
- How do I set up SPF for Postmark?
- My SPF and/or DKIM Record Won't Verify