Merge pull request #82 from wangnangg/master

Add Duke University email domain

autoconf/domains.csv

@@ -142,3 +142,5 @@ yandex.net,imap.yandex.com,993,smtp.yandex.com,465
 yandex.ru,imap.yandex.com,993,smtp.yandex.com,465
 yandex.ua,imap.yandex.com,993,smtp.yandex.com,465
 zoho.com,imap.zoho.com,993,smtp.zoho.com,465
+duke.edu,outlook.office365.com,993,smtp.office365.com,587
+