The problem: when I enable the use of filter_recipient it seems that this filter is solely responsible for deciding if an e-mail address is valid - not sendmail anymore.
Is there a way in filter_recipient to return a value and say to sendmail: "I don't know", check your aliases and virtusertable (in other words: standard sendmail procedure). So in short: filter_recipient should respond "ok" (LDAP search was good) or "sendmail, you check it".. it's this last thing. I need this because many e-mail addresses are just not available in our LDAP repository..
You may be looking at this backwards. As I understand it, filter_recipient lets you *continue* or reject, not accept or reject. If filter_recipient says "ok" to an address, it goes on to the normal sendmail procedure. (We've been using it here for ages, and we still issue plenty of "User unknown" errors for addresses that passed filter_recipient.)
So what you need to do is break down the address space by which servers handle it. Instead of doing an LDAP lookup for all addresses, only do it for those that will be going to the Exchange boxes. Return CONTINUE or REJECT for those based on the LDAP result, and then CONTINUE for everything else, letting sendmail take care of the rest.
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