-----Original Message----- From: CentOS [mailto:centos-bounces at centos.org] On Behalf Of Mike McCarthy, W1NR Sent: Saturday, January 28, 2017 8:45 AM To: CentOS mailing list Subject: Re: [CentOS] firewalld firewalld isn't the only thing that will prevent services from accessing the internet. I found that I needed to do a relabel before postfix could access DNS and I have seen other issues as well. Have you tried disabling the firewall to see if you can get connections to work? Then try to disable SElinux and see if that works. # netstat --inet -l -n Is the service listening on port 143? # systemctl stop firewalld Does it now work? # setenforce 0 Does it now work? Once you establish what's biting you then you can fix it. To force a relabel do # touch /.autorelabel # reboot Mike I have dovecot answering now. I can read mail using Mutt. I think I have problems with mysql/mariadb using roundcube. It may be I need to open ports for mariadb as well. Thanks