So, the question is: is there any way to tell courier to read esmtpacceptmailfor, hosteddomains and smtproutes data from LDAP? If not, is
No.
it much work to add this functionality? Where should i start?
It's a lot of work. Presently, only authdaemond and courierldapaliasd are linked against OpenLDAP client libraries, so not only will you need to write the actual code, but you'll also need to modified several configure scripts and makefiles so that all the modules that check each table will also link against OpenLDAP.
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