psi.edu.pl.		30 IN SOA ns1.cal.pl. hostmaster.psi.edu.pl. (
				2023103000 ; serial
				3600       ; refresh (1 hour)
				3600       ; retry (1 hour)
				1209600    ; expire (2 weeks)
				86400      ; minimum (1 day)
				)

psi.edu.pl.		30 IN TXT "v=spf1 a mx ip4:49.12.122.77 ip6:2a01:4f8:241:58e7:0:0:0:2
include:spf.cal.pl ~all"

psi.edu.pl.		30 IN A	49.12.122.77

Mail exchangers:
psi.edu.pl.		30 IN MX 10 mail.psi.edu.pl.

Name servers:
psi.edu.pl.		30 IN NS ns1.cal.pl.
psi.edu.pl.		30 IN NS ns2.cal.pl.