I use the mobile interface to check my e-mails. I have found that even though I can access my contacts on this interface, there is no way to send a mail to a contact from the contact list.
The contact list on this interface does not have any option to select a contact and send him a mail. There is also no option, when using the "create a new mail" screen, to select a contact from the list.
The only possibility is that if I remember how the e-mail address starts, I can type the first few letters and it will offer me a list of possible contacts.
This is something that should be corrected, as selecting contacts is a basic function of any e-mail software. It works fine on your desktop mode......