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If the auth backend (postgresql in my case) returns extra fields, and all of these extra_fields begin with 'userdb_', the auth_callback functions adds an unwanted extra tab at the end of the response: auth(default): client out: OK^I8^Iuser=foo at bar^I This extra tab at the end confuses exim's dovecot-auth handler (the exim-dovecot auth handler does not correctly count the number of