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A comprehensive guide to understanding and resolving Email Delivery Issues 1. Understanding Email Delivery: - Email Flow Basics: How an email is sent and delivered (SMTP, IMAP, POP3). - Key Components for email: Sender, receiver, SMTP server, and DNS (MX, SPF, DKIM, DMARC, PTR). - What is a Sender: The person who sends an email - What is Recipient: A person who receives the email - What is an SMTP server: An SMTP server, also known as an outgoing mail server, is a computer or software that handles outgoing email messages A) MX: ● What is MX? An MX record, or mail exchange record, is a Domain Name System (DNS) record that directs emails to a specific mail server: Example: mail.domain Proprity 0 ● What is Priority: Each MX record has a priority value, represented as a number. Lower numbers indicate higher priority. For example, an MX record with priority 10 will be used before one with priority 20 B) SPF: ● What is SPF: SPF is an email authentication protocol designed to prevent spammers from