The right tool makes a job easier and gets it done right, so here’s a collection of the tried and trusted FREE online tools I use most often. There are a lot of tools I’ve tried and not included so use this list to save yourself time trying out the duds.
Essential to check the results of split tests are valid given the test cell size used.
Split test statistical significance calculator -> https://www.zettasphere.com/abcalculator/
Creative and HTML
A selection of tools to help with email HTML coding and common tasks necessary when managing email complaint HTML.
Find symbols to use in subject lines http://emailstuff.org/encoding
Create bullet proof HTML buttons -> http://buttons.cm/
Convert styles to email compliant inline CSS -> http://inliner.cm/
Convert Word documents to clean HTML -> http://word2cleanhtml.com/
Convert HTML to Text email version -> http://beaker.mailchimp.com/html-to-text
Create placeholder images -> http://placehold.it/
Copyright free (CC0) clip art -> http://www.clker.com/
Tools to help assess and diagnose the deliverability situation. Use these as first step to get a quick sense of overall deliverability and to guide direction for further diagnosis.
Check blacklists, verify DNS, SMTP, SPF and more -> http://mxtoolbox.com/
Reputation check -> https://www.senderscore.org/
Reputation check -> http://www.senderbase.org/
Symantec reputation -> http://www.symantec.com/security_response/landing/spam/
Barracuda reputation -> http://www.barracudacentral.org/lookups
Microsoft SNDS -> https://postmaster.live.com/snds/
Verify single (one at a time) email address -> http://sureverify.com/
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If you’ve a tool that should be added let us know or drop it into the comments below.