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Email deliverability

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A comprehensive collection of questions and answers about email deliverability technical from email marketers, experts and technical documentation.
Does having an MX record on the from domain improve email deliverability?
What are the requirements for using a word mark with BIMI?
How accurate is email client market share data when Apple Mail intentionally opens messages?
What do Apple X-Headers mean in email filtering?
How does email forwarding affect SPF, DKIM, and DMARC validation?
What does the Gmail Actions user agent in unsubscribe requests indicate?
Why might an email provider not honor a DMARC p=reject policy?
How do email clients generate unsubscribe links, and what best practices should be followed?
Why is Gmail rejecting unauthenticated email from gmail.com due to DMARC policy when sending via Sendgrid?
How does relaxed domain alignment work in DMARC and SPF?
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