Hello, Questions about address verification:
I don't quite understand the difference between address_verify_negative_expire_time and address_verify_negative_refresh_time. If an address needs to be refreshed anyway, does it make any difference whether or not it was "expired"? What use is the expire time? When using this feature for recipient verification, how do you best avoid landing new account addresses into the negative cache if a new account gets incoming email at any point before the account shows up in the destination's list of valid addresses? Just live with a 3 hour delay? Turn the negative cache refresh time down to a ridiculously (uselessly) small time? If address_verify_map is set to an empty value, the cache is in memory only, and all is lost upon postfix reload, system reboot or even pulling the power? If the cache is kept in memory, how much space should be accounted for? How large do these databases get to be? Is there any interesting or useful difference between keeping the cache in memory versus specifying a file on a RAMDISK (tmpfs)? Thank you
