Authentication and infrastructure
- Can I implement DMARC even though I do not sign messages with DKIM?
- Is a Domain-based Message Authentication, Reporting, and Conformance (DMARC) record on a parent domain inherited by its sub-domains?
- How to ensure your DMARC record is not inherited by a domain's sub-domains
- Can I have multiple reporting addresses in my DMARC record?
- What is DomainKeys Identified Mail (DKIM) alignment for DMARC?
- What is Sender Policy Framework (SPF) alignment for DMARC?
- How often do mailbox providers send DMARC reports?
- What are the different tags of a DMARC record?
- What is a dynamic IP address and why should you avoid using one for sending marketing and transactional email?
- How does email forwarding affect authentication results?
- What is a bogon?
- What is back-off?
- 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?
- When should I use a shared IP address or a dedicated IP address?
- What is a dedicated IP address?
- How to clear an email deployment queue
- How to implement the List-Unsubscribe header
- What is an email client?
- What is the List-Unsubscribe header?
- What is a Mail Transfer Agent (MTA)?
- What is a Mail Delivery Agent (MDA)?
- What are some examples of Mail Transfer Agents (MTAs)?
- What is a Mail User Agent (MUA)?
- What is Internet Protocol version 4 (IPv4)?
- What is Internet Protocol version 6 (IPv6)?