Re: smtpd doesn't start

>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.