^"PORT NUMBERS". IANA. 15 يناير 2010. مؤرشف من الأصل في 2006-06-11. اطلع عليه بتاريخ 2010-01-16. urd 465/tcp URL Rendesvous Directory for SSM
^C. Hutzler؛ D. Crocker؛ P. Resnick؛ E. Allman؛ T. Finch (نوفمبر 2007). "Email Submission Operations: Access and Accountability Requirements". Best Current Practice. مجموعة مهندسي شبكة الإنترنت. مؤرشف من الأصل في 2018-03-04. اطلع عليه بتاريخ 2011-08-24. This document does not provide recommendations on specific security implementations. It simply provides a warning that transmitting user credentials in clear text over insecure networks SHOULD be avoided in all scenarios as this could allow attackers to listen for this traffic and steal account data. In these cases, it is strongly suggested that an appropriate security technology MUST be used.
