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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.
What is double DKIM signing and when is it necessary for email authentication?
Is BIMI required for Gmail Markup and what setup is needed for AMP?
Should DMARC checks focus on SPF HELO or Return-Path and should you focus on DKIM or SPF?
How important is it for reverse DNS to match SMTP banner for email deliverability?
Will Yahoo and Google require DMARC p=quarantine or p=reject in 2025?
What are the requirements and alternatives for implementing BIMI with VMC certificates, especially regarding trademark jurisdiction and costs?
What are prefetch and proxy opens and what causes a decrease in email open rates?
How can I check if a domain uses Entrust or Digicert for BIMI, and should I avoid Entrust?
How long should an email verification link remain active?
How can I identify and handle bot clicks and opens, particularly from Microsoft/Outlook domains, in email marketing campaigns?
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