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%d expands to empty string
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==========================
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The problem is that your username string lost the domain part. Dovecot doesn't
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keep track of the domain separately from username, so if something changes
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username from "user@domain" to just plain "user", the domain is lost and %d
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returns nothing. If you have 'auth_debug=yes', this shows up in logs like:
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IMAP or POP3 protocol doesn't have explicit support for domains. The usernames
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are commonly in user@domain format, and that is also where Dovecot gets the
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domain from. If the username doesn't have @domain, then the domain is also
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usually empty (unless 'auth_default_realm' setting is used).
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If you login as user@domain, but the %d is still empty, the problem is that
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your configuration lost the domain part by changing the username. Dovecot
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doesn't keep track of the domain separately from username, so if something
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changes username from "user@domain" to just plain "user", the domain is lost
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and %d returns nothing. If you have 'auth_debug=yes', this shows up in logs
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---%<-------------------------------------------------------------------------
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Info: auth(user@domain.org): username changed user@domain.org -> user
added
removed
doc/wiki/DomainLost.txt
