%% You should probably cite rfc6856 instead of this I-D.
@techreport{ietf-eai-rfc5721bis-08,
    number =    {draft-ietf-eai-rfc5721bis-08},
    type =      {Internet-Draft},
    institution =   {Internet Engineering Task Force},
    publisher = {Internet Engineering Task Force},
    note =      {Work in Progress},
    url =       {https://datatracker.ietf.org/doc/draft-ietf-eai-rfc5721bis/08/},
    author =    {Randall Gellens and Chris Newman and Jiankang Yao and Kazunori Fujiwara},
    title =     {{Post Office Protocol Version 3 (POP3) Support for UTF-8}},
    pagetotal = 14,
    year =      2012,
    month =     oct,
    day =       21,
    abstract =  {This specification extends the Post Office Protocol version 3 (POP3) to support international strings encoded in UTF-8 in usernames, passwords, mail addresses, message headers, and protocol-level text strings.},
}