I have a similar problem on Ubuntu 16.04, after update a week ago backup stopped working. In the cron log i got this "php warning: chmod...
in Ispconfig 3.1:
System > Server config > mail > Real-time Blackhole List
was "zen.spamhaus.org" but I added "dnsrbl.org"
I verified if these gmail servers are blacklisted, this is confirmed true
Thx for reply.
I was add "dnsrbl.org" to Real-time Blackhole List addres "dnsrbl.org"
dnsrbl.org reports many google servers that are spam...
Is it possible to add addres range eg gmail servers ip range to postfix whitelist ? how to add them because they are still on black lists....
Separate names with a comma.