diff --git a/mu4e/mu4e-utils.el b/mu4e/mu4e-utils.el
index 264c19f7..91271874 100644
--- a/mu4e/mu4e-utils.el
+++ b/mu4e/mu4e-utils.el
@@ -85,9 +85,12 @@ NODEFAULT, hour and minute fields will be nil if not given."
 
 (defun mu4e-user-mail-address-p (addr)
   "If ADDR is one of user's e-mail addresses return t, nil otherwise.
-User's addresses are set in `mu4e-user-mail-address-list')."
+User's addresses are set in `mu4e-user-mail-address-list'.  Case
+insensitive comparison is used."
   (when (and addr mu4e-user-mail-address-list
-	  (find addr mu4e-user-mail-address-list :test 'string=))
+	  (find addr mu4e-user-mail-address-list
+		:test (lambda (s1 s2)
+			(eq t (compare-strings s1 nil nil s2 nil nil t)))))
     t))
 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 
diff --git a/mu4e/mu4e-vars.el b/mu4e/mu4e-vars.el
index fe503449..37b61ddc 100644
--- a/mu4e/mu4e-vars.el
+++ b/mu4e/mu4e-vars.el
@@ -155,8 +155,11 @@ the attachment dir. See Info node `(mu4e) Attachments' for details."
 (defcustom mu4e-user-mail-address-list `(,user-mail-address)
   "List of e-mail addresses to consider 'my email addresses'.
 I.e. addresses whose presence in an email imply that it is a
-personal message. Note that e-mail addresses are case-sensitive,
-as per RFC531."
+personal message. Note that the local part (the part before '@')
+of e-mail addresses is case-sensitive, as per RFC531.  In
+practice however, most of the mail systems do not distinguish
+addresses based on the case, so the emails in this list will be
+matched case-insensitively."
   :type '(repeat (string :tag "Address"))
   :group 'mu4e)