Links from 2017-06-18
RFC 6764 - Locating Services for Calendaring Extensions to WebDAV (CalDAV) and vCard Extensions to WebDAV (CardDAV)
This specification describes how DNS SRV records, DNS TXT records, and well-known URIs can be used together or separately to locate CalDAV (Calendaring Extensions to Web Distributed Authoring and Versioning (WebDAV)) or CardDAV (vCard Extensions to WebDAV) services.
This page is the authorative specification of the config file that the Mozilla ISPDB and config services at ISPs return.
It is XML, with a clearly defined format, to be stable and usable by other mail clients, too. Update Aug 2010: In fact, Evolution and KMail and Kontact now use it, too.
Please do not submit or serve any configurations without SSL! There’s no reason in 2010 why users still need to read mail entirely unprotected.
If you are an ISP and think the server load is too high, try adding an SSL accelerator. They are cheap and widely used. In fact, even most freemail (!) providers these days support SSL, so if users pay you money for ISP service, that’s all the more reason to give them proper service. But first simply try to enable software SSL - small servers may be fine with SSL and without any additional installations.
Thunderbird 3.1 and later (and 3.0 to some degree) includes mail account autoconfiguration functionality. The goal of autoconfiguration is to make it very easy for users to configure the connection of Thunderbird to their email servers. In many cases, people should be able to download and install Thunderbird, enter their real name, email address and password in the Account Setup Wizard and have a fully functioning mail client and get and send their mail as securely as possible.