One of the issues with the WordPress and email sending is that if you need to use SMTP server (outside of your own server, or even for your own server depending on configuration), you can’t do it directly.
GD Press Tools Pro makes it easy to enable SMTP integration and few more things along the way.
The plugin allows you to set sender email and name, set reply-to email and name. And, most important is to set SMTP server information. You can set custom SMTP server (host, port and all) or, to select one of the directly supported SMTP servers and only provide login information. Directly supported SMTP servers include: