I did an update some hours ago, and after rebooting I noticed that posting did not work. I then saw this in the log, by the hundreds: 2.4> 2018-03-24 00:57:56 Telcontar postfix 4336 - - warning: process /usr/lib/postfix/bin//smtpd pid 17645 exit status 1 <2.4> 2018-03-24 00:57:56 Telcontar postfix 4336 - - warning: /usr/lib/postfix/bin//smtpd: bad command startup -- throttling <2.2> 2018-03-24 00:58:16 Telcontar postfix 30967 - - fatal: in parameter smtpd_relay_restrictions or smtpd_recipient_restrictions, specify at least one working instance of: reject_unauth_destination, defer_unauth_destination, reject, defer, defer_if_permit or check_relay_domains I have not changed the config at all, so this must be some new default. There is no "smtpd_relay_restrictions" in my main.cf. There is no active "smtpd_recipient_restrictions" in my master.cf, I only have commented out entries. I don't know what has changed, so I have no idea at this moment what to change. I have set: smtpd_recipient_restrictions = permit_mynetworks,reject_unauth_destination and it works. Comments? -- Cheers / Saludos, Carlos E. R. (from 42.2 x86_64 "Malachite" at Telcontar)