Supported Standards

This list collects standards that the Thunderbird family of applications currently at least partially implements or supports (in our code base, ignoring things like TCP which we inherit from upstream

Legend

• ✔ = This line item is supported for the given platform

• ✖ = This line item is not (yet) supported for the given platform

• empty = We have not collected the standards information for the given platform yet

• N/A = The standard does not apply to the given platform

Mail

Spec Name	Spec URLs	Desktop Status	Android Status	Standards Involvement	Comment
POP3	rfc1939	✔	✔
IMAP 4r1	rfc3501	✔	✔
IMAP IDLE	rfc2177	✔	✔
SMTP	rfc821	✔	✔
NNTP	rfc977	✔	✔

RSS Feeder

Spec Name	Spec URLs	Desktop Status	Android Status	Standards Involvement	Comment
RSS 0.9	rss-0-9-0	✔	N/A
RSS 2.0	rss-spec	✔	N/A
Atom 0.3	atom-0-3	✔	N/A
Atom 1.0	atom-1-0	✔	N/A

Mailing Lists

Spec Name	Spec URLs	Desktop Status	Android Status	Standards Involvement	Comment
List Management Headers	rfc2369, rfc5064	✔	✔

Security and Authentication

Spec Name	Spec URLs	Desktop Status	Android Status	Standards Involvement	Comment
MIME	rfc2045, rfc2046, rfc2047	✔	✔		All 3 are supported for both Desktop and Android platforms.
OpenPGP	rfc4880	✔	✔	Kai Engert actively involved
S/MIME version?		✔	✖
oAuth 2.0	rfc6749	✔	✔		See also https://oauth.net/2/

Address Book

Spec Name	Spec URLs	Desktop Status	Android Status	Standards Involvement	Comment
vCard	rfc6350 rfc2425 vcard-21	✔	✖		Version 4 used by default
CardDAV	rfc6352	✔	N/A		See also https://devguide.calconnect.org/CardDAV/
LDAP	rfc4511	✔	N/A		See also https://ldap.com/
LDIF	rfc2849	✔	N/A		Supported for import and export

Calendar

Spec Name	Spec URLs	Desktop Status	Android Status	Standards Involvement	Comment
iCalendar	rfc5545	✔	✖
CalDAV	rfc4791	✔	N/A		See also https://devguide.calconnect.org/CalDAV/
CalDAV Scheduling	rfc6638		N/A
iTIP	rfc2446	✔	✖

Instant Messaging

Spec Name	Spec URLs	Desktop Status	Android Status	Standards Involvement	Comment
IRC	rfc1459, rfc2812	✔	N/A
IRC TLS Port	rfc7194	✔	N/A
IRC CTCP	irc-ctcp	✔	N/A
IRC DCC	irc-dcc	✔	N/A
IRC SUPPORT	irc-00, irc-03, irc-05	✔	N/A		TODO: What about ISUPPORT 01 and ISUPPORT 02?
IRC NAMESX	irc-namesx	✔	N/A
IRC MONITOR	irc-monitor	✔	N/A
IRC WATCH	irc-watch	✔	N/A
IRCv3 Capability Negotiation	ircv3-cap-neg	✔	N/A		See also the IRCv3 Support Table
IRCv3 SASL 3.2	ircv3-sasl	✔	N/A
IRCv3 Message Tags	ircv3-message-tags	✔	N/A
IRCv3 Echo Message	ircv3-echo-message	✔	N/A
IRCv3 Multi-Prefix	ircv3-multi-prefix	✔	N/A
IRCv3 Server Time	ircv3-server-time	✔	N/A
XMPP	rfc3920, rfc3921, rfc6120, rfc6121	✔	N/A
XEP-0030	xep-0030	✔	N/A
XEP-0045	xep-0045	✔	N/A
XEP-0054	xep-0054	✔	N/A
XEP-0059	xep-0059	✔	N/A
XEP-0078	xep-0078	✔	N/A
XEP-0085	xep-0085	✔	N/A		Typing notifications
XEP-0092	xep-0092	✔	N/A
XEP-0199	xep-0199	✔	N/A
XEP-0203	xep-0203	✔	N/A
XEP-0245	xep-0245	✔	N/A
XEP-0249	xep-0249	✔	N/A
XEP-0280	xep-0280	✔	N/A
XEP-xxxx MUC Avatars	muc-avatars	✔	N/A
Matrix	matrix	✔	N/A	Thunderbird is an Ecosystem Member of the Matrix Foundation	UI only partially supports the full body of the specificaiton, not tracking on an MSC basis at this time
Olm/Megolm	olm, megolm	✔	N/A
OTR	otr-3-1-0, otr-4-1-1	✔	N/A