Cant send emails via Gmail SMTP, Timeout error

Hello,

i have an professional Wordpress plugin, MailPoet and it can send email via SMTP instead PHP mail.

When i try to connect gmail i get:

# telnet smtp.gmail.com 465

# traceroute 64.233.177.108

Which Gmail SMTP details i used:
smtp.gmail.com
my@gmail.com
TLS/SSL
25/465
all these tried.

im using CSF and i made sure that 465 and 25 is withing allowed outgoing ports.

# netstat -tulnp | grep 465

"php_openssl" appears to be enabled

Please how to fix it so im allowed to connect external SMTP like Gmail? Can you advice which WHM server config i need to check? cpanel support ticket: 6730293

Thank you

 

Thanks but it is NOT cause of the problem.

i tried various ports. it just do not connect as mentioned above

 

The cause is probably one of these three things?

1)
In Config server firewall configuration, there is section "IPv4 Port Settings" & "IPv6 Port Settings", i think it may be needed to add SMTP ports 25,465,587 into all TCP_OUT UDP_OUT variables in both above mentioned sections.
Then in same configuration CSF file, find section "SMTP Settings", set "SMTP_BLOCK =" to 0 or whitelist some cpanel users in variable "SMTP_ALLOWUSER ="
Save config and restart csf, lfd.
After that when logging via SSH to an cpanel account which i whitelisted (su - cpanelname), i see this:

but still my .php mailer says: "SMTP Error: Could not authenticate. | SMTP Error: Could not connect to SMTP host."

2) from WHM, check Home »Server Configuration »Tweak Settings
- Restrict outgoing SMTP to root, exim, and mailman (FKA SMTP Tweak) [?]
(Enabling this feature will redirect outgoing SMTP connections to the local mail server. root, exim, and mailman are still allowed to make direct connections.)

3) try to add gmail smtp IP (do command: telnet smtp.gmail.com 465) into config server firewall whitelist and ignore list?