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Thunderbird:Autoconfiguration:DNSBasedLookup: Difference between revisions
Thunderbird:Autoconfiguration:DNSBasedLookup (view source)
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1.) The '''MX''' record(s) of the user supplied email address is fetched from the DNS zone. In case no '''MX''' record exists, the '''A''' record of the base domain name is used [RFC 2821]. If there are '''MX''' records of different priorities, only the one with the highest priority is used, because lower priority ones may go to backup servers with a different setup. | 1.) The '''MX''' record(s) of the user supplied email address is fetched from the DNS zone. In case no '''MX''' record exists, the '''A''' record of the base domain name is used [RFC 2821]. If there are '''MX''' records of different priorities, only the one with the highest priority is used, because lower priority ones may go to backup servers with a different setup. | ||
2.) A '''TXT''' record with the content "''mailconf=https://''" is fetched from the DNS zone based on the lookup above. | 2.) A '''TXT''' record with the content "''mailconf=https://URL''" is fetched from the DNS zone based on the lookup above. | ||
3.) A sanity check shall be performed (correctness of the URL) and in case of failure proceed to the next possible '''TXT''' record as shown above. Only SSL secured locations are possible, meaning the protocol prefix ''https://'' '''must''' be present. | 3.) A sanity check shall be performed (correctness of the URL) and in case of failure proceed to the next possible '''TXT''' record as shown above. Only SSL secured locations are possible, meaning the protocol prefix ''https://'' '''must''' be present. | ||