<html><head><meta http-equiv="Content-Type" content="text/html; charset=us-ascii"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class=""><div class="">FROM RFC 5280:</div><div class=""><br class=""></div><div class=""> Implementers should note that the at sign ('@') and underscore ('_')</div><div class=""> characters are not supported by the ASN.1 type PrintableString.</div><div class=""> These characters often appear in Internet addresses. Such addresses</div><div class=""> MUST be encoded using an ASN.1 type that supports them. They are</div><div class=""> usually encoded as IA5String in either the emailAddress attribute</div><div class=""> within a distinguished name or the rfc822Name field of GeneralName.</div><div class=""> Conforming implementations MUST NOT encode strings that include</div><div class=""> either the at sign or underscore character as PrintableString.</div><div><br class=""></div><div>Do we want to say anything about using IA5String or UTF8String?</div><div><br class=""></div><div>Russ</div><div><br class=""></div><div><br class=""><blockquote type="cite" class=""><div class="">On Nov 19, 2020, at 5:11 PM, Stephen Davidson via Smcwg-public <<a href="mailto:smcwg-public@cabforum.org" class="">smcwg-public@cabforum.org</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><div class="WordSection1" style="page: WordSection1; caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;"><div style="margin: 0in; font-size: 11pt; font-family: Calibri, sans-serif;" class="">To date our discussion related to email addresses in S/MIME has been a general reference to rfc822Name along the lines of:<o:p class=""></o:p></div><div style="margin: 0in; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><o:p class=""> </o:p></div><div style="margin: 0in 0in 0in 0.5in; font-size: 11pt; font-family: Calibri, sans-serif;" class="">Extension ID: subjectAlternateName<o:p class=""></o:p></div><div style="margin: 0in 0in 0in 0.5in; font-size: 11pt; font-family: Calibri, sans-serif;" class="">Required?: Yes<o:p class=""></o:p></div><div style="margin: 0in 0in 0in 0.5in; font-size: 11pt; font-family: Calibri, sans-serif;" class="">Critical: Yes if the subject is an empty sequence; otherwise, SHOULD NOT be critical<o:p class=""></o:p></div><div style="margin: 0in 0in 0in 0.5in; font-size: 11pt; font-family: Calibri, sans-serif;" class="">Permitted Value(s): MUST contain at least one rfc822Name value. MUST NOT contain values of type: dNSName, iPAddress, uniformResourceIdentifier. otherName values (such as Microsoft UPN) MAY be included if the value is identical to an rfc822Name expressed in the SAN extension. Any rfc822Name and otherName value in the Subject DN must be repeated in the SAN extension. Each rfc822Name and otherName value must be verified with publicly documented and audited measures in accordance with Section 3.2.2.<o:p class=""></o:p></div><div style="margin: 0in 0in 0in 0.5in; font-size: 11pt; font-family: Calibri, sans-serif;" class="">References: RFC 5280, Section 4.2.1.6<o:p class=""></o:p></div><div style="margin: 0in; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><o:p class=""> </o:p></div><div style="margin: 0in; font-size: 11pt; font-family: Calibri, sans-serif;" class="">S/MIME and rfc822Name has enjoyed a proliferation of standards which leads to the question:<o:p class=""></o:p></div><ul type="disc" style="margin-bottom: 0in; margin-top: 0in;" class=""><li class="MsoListParagraph" style="margin: 0in; font-size: 11pt; font-family: Calibri, sans-serif;">Do we wish to summarise those rules relating to rfc822Name in this standard or in an informative appendix?<o:p class=""></o:p></li><li class="MsoListParagraph" style="margin: 0in; font-size: 11pt; font-family: Calibri, sans-serif;">Or do wish simply to provide a listing of the relevant standards?<o:p class=""></o:p></li></ul><div style="margin: 0in; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><o:p class=""> </o:p></div><div style="margin: 0in; font-size: 11pt; font-family: Calibri, sans-serif;" class="">If the latter, I believe the most relevant would include RFC 5322 (internet message format, sections 3.2.3 and 3.4.1), RFC 3696 (informational, checking of names), and RFC 8398 (internationalized email addresses).<o:p class=""></o:p></div><div style="margin: 0in; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><o:p class=""> </o:p></div><div style="margin: 0in; font-size: 11pt; font-family: Calibri, sans-serif;" class="">Missing anything? Comments?<o:p class=""></o:p></div><div style="margin: 0in; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><o:p class=""> </o:p></div><div style="margin: 0in; font-size: 11pt; font-family: Calibri, sans-serif;" class="">Best regards, Stephen<o:p class=""></o:p></div><div style="margin: 0in; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><o:p class=""> </o:p></div><div style="margin: 0in; font-size: 11pt; font-family: Calibri, sans-serif;" class="">RFC 5322: <a href="https://tools.ietf.org/html/rfc5322" style="color: rgb(5, 99, 193); text-decoration: underline;" class="">https://tools.ietf.org/html/rfc5322</a><o:p class=""></o:p></div><div style="margin: 0in; font-size: 11pt; font-family: Calibri, sans-serif;" class="">RFC 3696: <a href="https://tools.ietf.org/html/rfc3696" style="color: rgb(5, 99, 193); text-decoration: underline;" class="">https://tools.ietf.org/html/rfc3696</a><o:p class=""></o:p></div><div style="margin: 0in; font-size: 11pt; font-family: Calibri, sans-serif;" class="">RFC 8398:<span class="Apple-converted-space"> </span><a href="https://tools.ietf.org/html/rfc8398" style="color: rgb(5, 99, 193); text-decoration: underline;" class="">https://tools.ietf.org/html/rfc8398</a><o:p class=""></o:p></div><div style="margin: 0in; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><o:p class=""> </o:p></div></div><span style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; float: none; display: inline !important;" class="">_______________________________________________</span><br style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;" class=""><span style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; float: none; display: inline !important;" class="">Smcwg-public mailing list</span><br style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;" class=""><a href="mailto:Smcwg-public@cabforum.org" style="color: rgb(5, 99, 193); text-decoration: underline; font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px;" class="">Smcwg-public@cabforum.org</a><br style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;" class=""><a href="https://lists.cabforum.org/mailman/listinfo/smcwg-public" style="color: rgb(5, 99, 193); text-decoration: underline; font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px;" class="">https://lists.cabforum.org/mailman/listinfo/smcwg-public</a></div></blockquote></div><br class=""></body></html>