Comment 87 for bug 308181

FYI, I am planning to fetch the configuration from a webservice database via http for now, not DNS. The most I may do via DNS is to lookup a certain predefined hostname. See https://wiki.mozilla.org/Thunderbird:Autoconfiguration, Section "Proposal", Step 2 ("contact a mail configuration server of the provider"), Alternative 2: "just try to contact https://autoconfig.emailaddressdomain/mail/mozilla.xml?emailaddress=emailaddress and see whether that host/URL exists"