(setq message-citation-line-function 'message-insert-formatted-citation-line)
(setq message-citation-line-format "On %a, %b %d %Y, %f wrote:n")
(setq smtpmail-multi-accounts
      (quote
       ((yahoo . ("xxxx@yahoo.com"
                 "smtp.mail.yahoo.com"
                 587
                 "xxxxx@yahoo.com"
                 nil nil nil nil))
    (other . ("xxxxx@other.com"
                 "smtp.other.com"
                 465
         "xxxx@other.com"
                 ssl nil nil nil))
    (etc . ("xx@etc.com"
                 "smtp.etc.com"
                 465
         "xx@etc.com"
                 ssl nil nil nil))
     ;; ...
    )))

(setq smtpmail-multi-associations
      (quote
       (("xxxx@yahoo.com" yahoo)
    ("xxx@other.com" other)
    ("xx@etc.com" etc)
     ;; ....
    )))

(setq smtpmail-multi-default-account (quote yahoo))
(setq message-send-mail-function 'smtpmail-multi-send-it)

(setq mu4e-compose-dont-reply-to-self t)
(setq mu4e-user-mail-address-list '("xxxx@yahoo.com"
                    "xxx@other.com"
                    "xx@etc.com"
                     ;; ...
                     ))

(setq user-full-name "XXXXXX")
(setq user-mail-address "xxx@other.com")