Verification error in daily run on fresh 11.2-RELEASE install

[Milan Obuch]

Hi,

I did fresh install of FreeBSD 11.2-RELEASE on new amd64 system, and
daily job run has following in mailed output:

Checking for rejected mail hosts:
Certificate verification failed for /C=US/ST=Arizona/L=Scottsdale/O=Starfield Technologies, Inc./CN=Starfield Root Certificate Authority - G2
34374371912:error:14090086:SSL routines:ssl3_get_server_certificate:certificate verify failed:/usr/src/crypto/openssl/ssl/s3_clnt.c:1269:
fetch: https://www.ietf.org/timezones/data/leap-seconds.list: Authentication error

This error occurs too when I try to fetch mentioned URL from shell. Can
someone suggest what to do in order to get rid of this error? Do I
understand it right the error means my system is unable to verify
certificate validity for www.ietf.org site?

Regards,
Milan