Objective

Understand how spam filters work and learn how to ensure your email sendings don't end-up in the subscribers' spam folder.

Table of contents

Related resources

• Postmark - Support Center
• SendGrid - Knowledge Center
• SendGrid - Blacklisted how-to?
• CampaignMonitor - Help Center
• ReturnPath - SenderScore
• Google - Postmaster Tools
• Postmark - Spam Score
• Campaign Monitor - How to Determine the Best Length for Your Email Subject Lines
• Mailchimp - Email Marketing Benchmark
• Campaign Monitor - Ultimate Email Marketing Benchmarks for 2019
• GetResponse - Email Marketing Benchmarks
• Econsultancy - Emojis in Email Subject Lines
• Valimail - DMARC Domain Checker
• Mail Tester - Test the Spammyness of your Emails
• Tedium - Why emails get cut off?

This guide is meant to provide basic knowledge on a complex topic in the most concise manner. Never take anything as the gospel truth, read from multiple sources before acting.

Glossary

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What is a DNS record?

DNS stands for Domain Name System

A DNS record is a database record used to map a URL to an IP address (this allows you to change web hosts without changing your domain name). DNS records are stored in DNS servers and work to help users connect their websites to the outside world. When the URL is entered and searched in the browser, that URL is forwarded to the DNS servers and then directed to the specific Web server. This Web server then serves the queried website outlined in the URL or directs the user to an email server that manages the incoming mail.

The most common record types are A (address), CNAME (canonical name), MX (mail exchange), NS (name server), PTR (pointer), SOA (start of authority) and TXT (text record)

What is a CNAME record?

CNAME stands for Canonical Name

CNAME records are a type of DNS records that can be used to alias one name to another.