1734 POP3 AUTHentication command
1939 Post Office Protocol - Version 3
2202 Test Cases for HMAC-MD5 and HMAC-SHA-1
2222 Simple Authentication and Security Layer (SASL)
2286 Test Cases for HMAC-RIPEMD160 and HMAC-RIPEMD128
2831 Using Digest Authentication as a SASL Mechanism
