“If there is anyone known to you who might benefit from a letter or a visit, do not on any account postpone the writing or the making of it. The difference made will almost certainly be more than you have calculated.”
I have just started reading Christopher Hitchens’ “Hitch – 22” A Memoir” and I’m quoting from it already. Since this quote is only from the Foreword, more could follow.
I doubt that an email or a call will ever have the same effect as a letter or a visit.