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→Implementation: Restore spec for lookup XML at provider, and DNS, add DNS SRV
#* It will not work for corporate email accounts.
#* If a provider disagrees with a setting there, it can override the configuration by simply providing the config server in step 2.
# Try to get the configuration from the provider (not yet implemented)
#* Try to contact https://autoconfig.<i>emailaddressdomain</i>/mail/mozilla.xml?emailaddress=<i>emailaddress</i> and see whether that host/URL exists.
#* and/or, define a DNS TXT record on domain example.net (for my.account@example.net) which contains an URL like e.g. https://www.example.net/mozilla.xml . A similar, but slightly different proposal is described in detail on [[Thunderbird:Autoconfiguration:DNSBasedLookup|DNSBasedLookup]].
#* and/or use DNS SRV records _imap._tcp.example.com etc.
#* That file contains the mail configuration. Content is described on [[Thunderbird:Autoconfiguration:ConfigFileFormat|ConfigFileFormat]].
# If we couldn't find any configuration file, we try to guess the configuration using some heuristics. We try imap.<i>domain</i>, pop.<i>domain</i>, pop3.<i>domain</i>, smtp.<i>domain</i> and mail.<i>domain</i>, and for each, try the common 2-3 ports. We check whether SSL is available, which authentication algorithms are announces by the server in the CAPABILITIES etc..
# If all fails, we ask the user to enter the configuration manually.
