On Thu, Jul 07, 2016 at 12:14:19PM +0200, Chris wrote: > what happens, if reject_unverified_recipient is enabled, but the > server of the relay domain isn't available?
The name of the restriction contains the answer. The recipient address cannot be verified, so the mail is rejected. See: http://www.postfix.org/ADDRESS_VERIFICATION_README.html#recipient and carefully go through the related settings. > I think the mail should be accepted, at least if the destination > address is cached. If cached, yes. Another good link, linked from said README: http://www.postfix.org/verify.8.html Look at the address_verify_*_time settings which control how long addresses are cached. > What happens if it is not already known? See above. That is what you asked it to do, by using a reject_unverified_recipient restriction. In the real world this should not be much of a problem, because most valid recipients will be receiving mail within the cache period. If it is a problem, get and maintain a local relay_recipient_maps listing all valid recipients. http://www.postfix.org/ADDRESS_CLASS_README.html#relay_domain_class -- http://rob0.nodns4.us/ Offlist GMX mail is seen only if "/dev/rob0" is in the Subject:
