From Secure Mail  on the iOS devices you could receive this error message  "No Browser Installed. Please install Secure Web or another web browser to open this link" when try to open a hyperlink or a url from an email message.
The iOS device has the standard Safari browser installed

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Instructions

By default this configuration is embedded into the MDX file  ^http:=ctxmobilebrowser:,^https:=ctxmobilebrowsers: that configuration is located under the  Allowed URLs section, the string shown before means that you are replacing the HTTP or HTTPS schema with the  ctxmobilebrowser that will cause that all the requests are going to be opened on the Secure Web App. In order to solve this issue you need to install Secure Web or you can delete the ctxmobilebrowser configuration and leave only the HTTP and HTTPS schema alone, by default all the HTTP request on iOS devices are going to be opened on Safari, so the Secure Mail will try to open the application com.apple.mobilesafari (Safari) to open the website

The following is an example of the Secure Mail application using Secure Web as the default browser


And this is a configuration using Safari




Before save the configuration please add com.apple.mobilesafari on the App URL schemes