Resources
Email guides, examples, and resources
Everything the Loops team has learned about sending email people actually open. Start with a guide, browse the examples, or look up a term.
Guides
How to make sure your email lands and gets read.
Migrate from Mailgun to Loops
Swap the SDK, map template sends to dataVariables, verify your domain, and cut over one email type at a time.
Migrate from Brevo to Loops
Swap the SDK, map each call, verify your domain, and cut over one email type at a time.
SMTP error codes explained
What SMTP reply codes like 421, 550, and 554 mean, and how to fix them.
Customer engagement tools
What counts across email, in-app, push, chat, and analytics, with 9 options compared.
Free tools
Free email tools you can use right now, no signup required.
Subject line tester
Score and preview your subject line before you hit send.
UTM link generator
Build tagged campaign URLs so your analytics stay clean.
Email DNS checker
Look up SPF, DKIM, and DMARC records for any domain.
EML viewer
Open and read raw .eml files right in your browser.
Spam word checker
Spot the trigger words that push email into spam.
Mailto link generator
Make mailto links with a prefilled subject and body.
DMARC record generator
Generate a DMARC policy record to protect your domain.
Email by type
Loops sends every kind of email from one platform. Pick the job you need to do.
Email examples
Emails you can copy, with notes on why they work.
Email glossary
Plain-English definitions for the terms you will run into.
Common questions
What is the difference between transactional and marketing email?
What is lifecycle email?
Do I need a separate tool for transactional and marketing email?
Does Loops have a free plan?