Very often php mail applications rely on the generic settings in the PHP.INI file, however this will not function with EPHost's Windows Platform.

A "from" address must be supplied, please see the follow article for a code solution... 

    See the Knowledge base Article on "Sending Mail using php mail function"

OR use the following option.

This option establishes a from address by default when sending email using PHP if it is not otherwise done in the code

1. Create a file called .user.ini in the /wwwroot folder of your website.
2. Put the following in the file and save it.
   
        sendmail_from = info@your-email-address.com
3. Reload your application. e.g. open, edit and save the web.config file. To edit just put a few spaces and then delete them.

You can use this as a drop in replacement for overriding many php.ini settings.

ALSO SEE: Sending Mail using PHP Mail Function | How to Setup PHP Websites using .user.ini file

Also See: Email Settings POP3 / IMAP | Check email online | Email Troubleshooting | Adding an email to your hosting account WINDOWS / LINUX 

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