Using SMTP in WordPress
For WordPress there is an excellent Plugin called WP Mail SMTP, which can be used to send email through Google’s SMTP servers.Download and install the Plugin and in the settings page you have to set the following options.
- SMTP Host: smtp.gmail.com
- SMTP Port: 465
- Encryption: Use SSL encryption
- Authentication: Yes
- Username: Your full Gmail address or Google App email
- Password: your account password
Source: sudarmuthu.com