Steps to reproduce
Open contacts and select a contact.
A click on the blue colored email address leads to sending an email to this person.
This option is not salient enough (every test persons took some time to find it, i think they searched for an extra button)
Maybe an extra button for writing an email out of the address book next to "Edit" or a more salient option would be helpful.
e.g: a e-mail-symbol (envelope) next to the e-mail-adress (the blue colored e-mail-adress itself can stay an option to click on it to write a e-mail to that contact anyway)