%% You should probably cite rfc2034 instead of this I-D. @techreport{freed-smtperror-01, number = {draft-freed-smtperror-01}, type = {Internet-Draft}, institution = {Internet Engineering Task Force}, publisher = {Internet Engineering Task Force}, note = {Work in Progress}, url = {https://datatracker.ietf.org/doc/draft-freed-smtperror/01/}, author = {Ned Freed}, title = {{SMTP Service Extension for Returning Enhanced Error Codes}}, pagetotal = 6, year = 1996, month = jul, day = 3, abstract = {This memo defines an extension to the SMTP service {[}RFC-821, RFC-1869{]} whereby an SMTP server augments its responses with the enhanced mail system status codes defined in RFC 1893. {[}STANDARDS-TRACK{]}}, }