Everything you need to know about VMail
Email clients use different rendering standards. This is why your email can be displayed not as you designed it. You need to check that your message code won't cause rendering issues.
VMail (Validate Email) the markup (HTML, CSS) of HTML email template content in search of problematic elements. For each it finds, it displays the list of email clients that lack support for it or support it only partially.
Nope, VMail cannot do this. It is using database with email clients limitations about different HTML and CSS rules. Based on this database it parse your HTML template and provide report for it
VMail collect the data on support for particular HTML & CSS rules from Caniemail.com
There are three ways to include styles within an email: using external stylesheets, embedded styles, or inline styles. While external stylesheets are a great option for web design, they aren't the best option for email design—many webmail clients block links to external stylesheets
Embedded styles are becoming increasingly popular due to the rise of mobile and associated popularity of responsive design techniques, but they do have their limitations. Since embedded styles are placed in the placed in the <head> of HTML documents, and some email clients, like Gmail, strip out most of the CSS styles in the <head>, the result is a royal mess in those inboxes
Inline styles are applied directly to HTML elements in each line of HTML—and are generally the safest way to ensure rendering compatibility across various email clients. However, inline styles can be time-consuming to write and a bit challenging to manage
While it's entirely possible to hand code inlined CSS from the start, it's time consuming and difficult to maintain. By clicking button "Inline CSS in HTML"/"Inline CSS" application will try to load all your external stylesheets and with embedded styles inline its properties in HTML tags. This solution is not 100% error prone and can lead to broken HTML email template. For more control, you can use alternative services (they contain additional settings, which can be tunned for your HTML email template):
More info how to build email template you can get from this article
Nope, it doesn't. VMail fully work in your browser and do not have any backend/server to process your API requests
Yes, it is! You can visit app without internet and browser should serve it without problem (only functionality "Sample HTML/CSS" will not available in offline mode)
Yes, it is fully free and open source