Is it permissible to correspond with one's fiancée via e-mail to agree upon matters before marriage, if her parents are aware of it?

It is permissible for a suitor to correspond with his fiancée regarding marriage arrangements, provided her parents are aware and informed, and the messages are free of emotional expressions and do not lead to temptation. It must be emphasized that the suitor remains a stranger to his fiancée until the marriage contract is concluded. It is preferable that correspondence and conversations take place with her guardian.