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SMTP message – “could not open socket” error

This is due to the Zend framework used in Magento 1

There are two possible reasons for this problem

1. OpenSSL is not installed

Use the phpinfo module to see if OpenSSL is installed

2. Firewall problem（ Close the firewall)

View firewall status:

[ [email protected] ~]# service iptables status

Iptables: firewall is not running

Open firewall:

[ [email protected] ~]# service iptables start

Turn off firewall:

[ [email protected] ~]# service iptables stop