Smtp error

[php-empire]

hello all
i have two big problem on my cpanel
1 ) when send email via horde or SquirrelMail show error messege.

error messege :

Connection timed out
Server replied: 110 Can't open SMTP stream.

2) when send and recive pop3 email sho error message :

could not retive mail.yourdomain.com

please help me

[alhadsubair]

This problem usually occurs when CSF ( Config Server Firewall ) is installed on your server and it is interacting with the working of squirrel mail. So while configuring CSF enable both SMTP_BLOCK & SMTP_ALLOWLOCAL . Enabling just SMTP_BLOCK can cause this issue.

$ vi /etc/csf/csf.conf
set
SMTP_BLOCK = '0'
save and exit
restart csf.
This will fix.

[AndyB78]

Instead of setting SMTP_BLOCK="0", I set SMTP_ALLOWLOCAL="1".

Is this safe?

Regards!

[cPanelDon]

Instead of setting SMTP_BLOCK="0", I set SMTP_ALLOWLOCAL="1".

Is this safe?

When the option "SMTP_BLOCK" is enabled it is then required to enable the option "SMTP_ALLOWLOCAL" to allow the cPanel hosted Webmail programs to send e-mail; this includes Horde, SquirrelMail, and RoundCube, when accessed via cPanel Webmail. If the option "SMTP_ALLOWLOCAL" is disabled but the option "SMTP_BLOCK" is enabled then it will break the ability for the aforementioned cPanel hosted Webmail programs to send e-mail.

Please note that, due to the similar nature in how they function, the CSF option "SMTP_BLOCK" conflicts with the SMTP Tweak feature in the Security Center of WHM; additionally, only one of the two features should be enabled at any given time, and they both should not be active simultaneously.

As CSF is a third-party product I recommend referring to the vendor web site for official support and clarification on usage of specific options:
http://www.configserver.com/
http://www.configserver.com/cp/csf.html
http://forum.configserver.com/
http://www.configserver.com/contact.html
http://www.configserver.com/support.html