Making sure your e-mails are working right is a huge part in running a successful GSA Search Engine Ranker campaign. You’ll want to use catch-all emails from SEREmails to make sure all your e-mails get to your inbox without hitting some sort of spam filter.
For best results, I recommend you use XEvil and GSA Captcha Breaker. I have XEvil selected as the first captcha service and GSA Captcha Breaker as secondary captcha service. This way any captchas not solved by XEvil will be passed on to GSA Captcha Breaker.