by Darwin

Letter to a foreign company.

1 . Crossmail in the most popular email customers in Europe and the United States:
by Gmail
by Yahoo
The Outlook.com
by AOL
Windows Live Mail 2012
The Thunderbird
by Mac Mail
Microsoft Outlook 2007/2010/2013/2016

2nd Adaptivity and correct display for iPhone 5+ and Android 4.4+

Three Send a letter to the MailChimp service.

All requirements were fulfilled in full.