Thanks again!
I'll have to recheck (docker not running atm; not at system), but I'm quite
sure that the IP address for docker interface is as it seems, 172.18.0.1.
How might I get postfix to listen on 172.18.0.1? Is there buried in postfix
cfg something to specify?
Actually, I think I did add the 172.18.0.0/16 (or /17 or whichever it is to
expand out to .255.255) subnet to the postfix config. I think that was just
for send mail permission though -- Will need to check that also.
Or I suppose I could map 172.18.0.1:25 to local host:25 somehow...?
Much appreciate the help!