diff --git a/bin/mw b/bin/mw
index 501f2e3..111c8d5 100755
--- a/bin/mw
+++ b/bin/mw
@@ -183,7 +183,7 @@ delete() { if [ -z "${fulladdr+x}" ]; then
 askinfo() { \
 	[ -z "$fulladdr" ] && echo "Give the full email address to add:" &&
 		read -r fulladdr
-	while ! echo "$fulladdr" | grep -qE "^.+@.+\.[A-z]+$"; do
+	while ! echo "$fulladdr" | grep -qE "^.+@.+\.[A-Za-z]+$"; do
 		echo "\`$fulladdr\` is not a valid email address. Please retype the address:"
 		read -r fulladdr
 	done