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Informational resources
Best Practices for Successful Email Delivery
Black Friday & Cyber Monday: 5 Tips to Stand Out in a Crowded Inbox During the Holidays
Domain Reputation or IP Reputation: Which One Does Gmail Care About More?
Growth Email Hacks: Dynamic Images in Emails
Email Remains the Most Effective Marketing Platform
Email Safe Fonts & Typography: Improving Accessibility in Emails
Free email validation API for web forms
FML, Every Email I Send Goes to Gmail’s Promotions Tab
Handle Incoming Emails like a Pro [Mailgun API 2.0]
Protecting Your Deliverability with Honeypots
Migrating from Mandrill to Mailgun
Tips & Tricks: Avoiding Gmail spam filtering when using Ruby on Rails Action Mailer
Designing Transactional Email Templates with HTML
Which SMTP Port Should I Use? Understanding Ports 25, 465, & 587