On 4/6/20 1:44 PM, Grant Taylor wrote: > On 4/6/20 11:14 AM, Michael Orlitzky wrote: >> Why don't you say which MTA it is that both (a) combines MX records with >> different priorities, and (b) doesn't retry messages to the primary MX? > > You seem to have conflated the meaning of my message. > > I only stated that I've seen multiple MTAs to (a) combine MX records. > > I never said that those MTAs also didn't (b) retry message delivery. >
Ok, you're right. My suggestion to create multiple records was in response to the claim that there are MTAs that will try a backup MX, but won't retry the primary MX, which is false to begin with. Trying to argue against an untrue premise only muddied the water. Back to the point: all real MTAs retry messages. You can find bulk mailers and spam zombies and one or two java "forgot password" webforms from 1995 that won't retry; but by and large, everyone does. If anyone has evidence to the contrary, it should be easy to find and present. If, on the other hand no such MTAs exist, then it's quite pointless to run a second MX for the five seconds a year that it's useful.
