MailHog : MailHog is an email testing tool for developers:
Configure your application to use MailHog for SMTP delivery
View messages in the web UI, or retrieve ...
FormLinter : Increase your form conversions by fixing common usability issues
Enter a URL. FormLinter will find a form on the page and let you know if it can be im...
Requestdiff : Differentiate HTTP headers and content body of two GET URLs.
Free online service that allows you to test your emails for Spam, Malformed Content and Mail Server Configuration problems