Testing HTML email rendering

I found emailonacid.com today (beta, currently free†) - have only played with it a little but so far so good. It simulates the following clients:

• AOL 9
• Entourage 2004 & 2008
• Gmail
• Hotmail
• Windows Live Mail
• Windows Mail
• Mac Mail
• Outlook 2003 & 2007
• Thunderbird 2, 3 & Beta
• Yahoo Classic / Yahoo Mail

The very helpful thing about this service is it tells you what code is not supported in which client.

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†Edit: Not free anymore, but provides a 7 day free trial.

You could also use PutsMail to test your emails before sending them.

PutsMail is a tool to test HTML emails that will be sent as campaigns, newsletters and others (please, don't use it to spam, help us to make a better world).

Main features:

• Check HTML & CSS compatibility with email clients
• Easily send HTML emails for approval or to check how it looks like in email clients

Yes, you can use any of these popular tools:

• Litmus https://litmusapp.com/
• MailChimp https://www.mailchimp.com/
• CampaignMonitor https://www.campaignmonitor.com/
• Testi@ https://testi.at/
• Email on Acid @ https://www.emailonacid.com/
• Email2Go https://email2go.io