John C. Klensin, Ned Freed, Marshall T. Rose, Dave Crocker. SMTP Service Extension for 8-bit MIME Transport. RFC, 6152:1-7, March 2011. [doi]
@article{rfc6152, title = {SMTP Service Extension for 8-bit MIME Transport}, author = {John C. Klensin and Ned Freed and Marshall T. Rose and Dave Crocker}, year = {2011}, month = {March}, doi = {10.17487/RFC6152}, url = {https://doi.org/10.17487/RFC6152}, researchr = {https://researchr.org/publication/rfc6152}, cites = {0}, citedby = {0}, journal = {RFC}, volume = {6152}, pages = {1-7}, }