>this sounds a lot like a DNS failure. DNS seems to work.
# cat /etc/resolv.conf # Generated by athn0 dhclient nameserver 192.168.1.1 # dig protonmail.com MX ; <<>> DiG 9.4.2-P2 <<>> protonmail.com MX ;; global options: printcmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 26238 ;; flags: qr rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 0, ADDITIONAL: 0 ;; QUESTION SECTION: ;protonmail.com. IN MX ;; ANSWER SECTION: protonmail.com. 3600 IN MX 5 mail.protonmail.ch. protonmail.com. 3600 IN MX 10 mail1.protonmail.ch. ;; Query time: 59 msec ;; SERVER: 192.168.1.1#53(192.168.1.1) ;; WHEN: Mon May 29 12:55:12 2017 ;; MSG SIZE rcvd: 88 # dig @8.8.8.8 protonmail.com MX ; <<>> DiG 9.4.2-P2 <<>> @8.8.8.8 protonmail.com MX ; (1 server found) ;; global options: printcmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 48677 ;; flags: qr rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 0, ADDITIONAL: 0 ;; QUESTION SECTION: ;protonmail.com. IN MX ;; ANSWER SECTION: protonmail.com. 1199 IN MX 5 mail.protonmail.ch. protonmail.com. 1199 IN MX 10 mail1.protonmail.ch. ;; Query time: 107 msec ;; SERVER: 8.8.8.8#53(8.8.8.8) ;; WHEN: Mon May 29 12:55:52 2017 ;; MSG SIZE rcvd: 88 >Hello, >I had the same problem recently. >Please check the rights on the file smtpd.conf and if necessary >chmod 600 smtpd.conf It doesn't help, smtpd hangs with 644, 600, 000 chmodded smtpd.conf and without smtpd.conf at all.
