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Can I use HGK SMTP plugin with Gmail or Google Apps?

Yes. In fact it was originally developed to work with Gmail. The following options should get you going:

• SMTP server address: smtp.gmail.com
• Use SSL connection: yes (checked)
• SMTP server port: 465
• SMTP username: your Gmail / GoogleApps email address
• SMTP password: your Gmail / GoogleApps password

This plugin does not seem to affect my WordPress blog mailing behavior?

Make sure that no mailing, SMTP or other plugins with similar functionality are active.

Still this plugin does not seem to affect my WordPress blog mailing behavior?

HGK SMTP plugin works by modifying behavior of wm_mail() function. Unfortinately, some plugins are known to call PHP's mail() directly. If the case, you should be able to correct that by searching for instances of mail() and replacing them with wp_mail(). Since the parameters to the both functions are the same, this simple textual replacement works.