Cant send mails with PHPMailer

I can not send mails (I want to send them directly from Gmail, not with the mail () function), I'm trying the PHPMailer library and when I run it from a URL It does not work, it disconnects me from the server in the middle of the connection. If I do from SSH, with the root user, all right, send the mails correctly. The option: whm > security center > SMTP Restrictions is Disable. Now if I run from the browser that same, it does not work: In: /var/log/apache2/error_log does not register errors. I want to use the port 465, 587 and 25. I see if is a rule in iptables and i found that: [root@hosting tienda]# iptables -S|grep "465" -A INPUT ! -i lo -p tcp -m conntrack --ctstate NEW -m tcp --dport 465 -j ACCEPT -A SMTPOUTPUT -o lo -p tcp -m multiport --dports 25,465,587,26 -j ACCEPT -A SMTPOUTPUT -p tcp -m multiport --dports 25,465,587,26 -m owner --gid-owner 991 -j ACCEPT -A SMTPOUTPUT -p tcp -m multiport --dports 25,465,587,26 -m owner --gid-owner 12 -j ACCEPT -A SMTPOUTPUT -p tcp -m multiport --dports 25,465,587,26 -m owner --uid-owner 202 -j ACCEPT -A SMTPOUTPUT -p tcp -m multiport --dports 25,465,587,26 -m owner --uid-owner 0 -j ACCEPT -A SMTPOUTPUT -p tcp -m multiport --dports 25,465,587,26 -j LOGDROPOUT (that gid and uid are of cpaneleximfilter, cpanel and root) And then i add that, but dont work: -A SMTPOUTPUT -p tcp -m multiport --dports 25,465,587,26 -m owner --uid-owner 1062 -j ACCEPT -A SMTPOUTPUT -p tcp -m multiport --dports 25,465,587,26 -m owner --gid-owner 1064 -j ACCEPT (uid 1062 and gid 1064 are the user and group that i testing) I see that the "CSF firewall" is activated, but i dont know how check if are a problem in that option of WHM. How i can check of the CSF Firewall is the problem? Or where i can get the fix? Thanks!