Authentication and infrastructure
- How to group existing subscriptions in the Return Path Universal Feedback Loop (uFBL)
- Why is a subscriber ID needed for complaint processing?
- What is a subscriber ID for complaint processing and how do I implement one?
- What is a dynamic IP address and why should you avoid using one for sending marketing and transactional email?
- How to interpret SPF authentication verification results
- Connection and Throughput Guide (PDF)
- Why is Sender Policy Framework (SPF) not effective in blocking domain spoofing without the implementation of other authentication standards?
- How can I lookup my DMARC record?
- How does email forwarding affect authentication results?
- What is authentication?
- What is DomainKeys Identified Mail (DKIM)?
- What is Sender Policy Framework (SPF)?
- Troubleshooting Sender Policy Framework (SPF) failures
- What is Domain-based Message Authentication Reporting and Conformance (DMARC)?
- How many bits should DomainKeys Identified Mail (DKIM) keys be?
- Can I implement DMARC even though I do not sign messages with DKIM?
- How are DomainKeys Identified Mail (DKIM) and DomainKeys different?
- What is a bogon?
- Do all domains need a Sender Policy Framework (SPF) record?
- Should Sender Policy Framework (SPF) be added as a TXT type record or an SPF type record?
- Are SenderID records still being validated?
- What is back-off?
- Is a Domain-based Message Authentication, Reporting, and Conformance (DMARC) record on a parent domain inherited by its sub-domains?
- What is opportunistic encryption?
- What is an open relay and how do I close one?
- What is an open proxy and how do I configure my servers to avoid it?
- What is the difference between the Mail From (MFrom) address and the From address?
- Do SMTP servers reject email if the rDNS does not match the HELO?
- How long does a Domain Name System (DNS) change need to take effect?
- Can I have multiple reporting addresses in my DMARC record?