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Email deliverability

Technical

A comprehensive collection of questions and answers about email deliverability technical from email marketers, experts and technical documentation.
How can I change the retransmission time in Postfix?
What are the risks of GET requests on opt-out links?
How does email code quality and size impact email deliverability?
What are common phishing issues with Sendgrid and Mailgun and how are they addressed?
How do G Suite and Proofpoint compare for email gateway security?
How to use plus-tagged email addresses for subscriptions and unsubscribes?
Does DMARC improve email deliverability and should ESPs push senders to set it up?
How important is the 10 DNS lookups limit on SPF records?
What is gmsil.com and is it a legitimate domain or a spam trap?
Can I set DMARC to reject if my domain doesn't send email?
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