%% You should probably cite rfc6856 instead of this I-D.
@techreport{ietf-eai-rfc5721bis-06,
    number =    {draft-ietf-eai-rfc5721bis-06},
    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/06/},
    author =    {Randall Gellens and Chris Newman and Jiankang Yao and Kazunori Fujiwara},
    title =     {{POP3 Support for UTF-8}},
    pagetotal = 13,
    year =      2012,
    month =     jul,
    day =       16,
    abstract =  {This specification extends the Post Office Protocol version 3 (POP3) to support un-encoded international characters in user names, passwords, mail addresses, message headers, and protocol-level textual strings.},
}