For a store that I'm building it is important that the email address is correct, as no goods are sent by post but the bill is a confirmation of the purchase that one should print out and take with you.
To make sure that there are no typing errors are made in the mail I want to performing a check by mail twice to enter. If the imported addresses do not match then the user must be notified to correct it before he can proceed with the ordering process.
I can not find this control in VM, there may be a plugin available, but Google has not yet sent me in the right direction.
Anyone have any idea how to carry this out?
I don't know if anyone has made a plugin for this yet, I have never heard of one. VM uses Joomla's registration fields, so I use a simple validator. (http://extensions.joomla.org/extensions/access-a-security/site-security/login-protection/23091)
To compare two entry fields you could use a template override for registration and apply some JavaScript. eg http://lab.artlung.com/compare-fields/