Hi, I am having a similar issue. After finally getting the settings correct and receiving a successful send from the test e-mail on the pluggin - I have yet to actually receive an e-mail.
I went to my domain's e-mail server and sent an e-mail to the email address I was trying to send to - and it sent the e-mail.
However, the WP SMPT MAIL plugin test does not, eventhough it says it was successful.
I have spent lots of time researching wiki and looking through support forums/posts, but have not gotten any answers and have seen a lot of posts like the one above go without any responses. It is very disheartening.
I have 2 domains - both fully hosted. I am testing pages on a staging subdomain, http://www.staging.secretfamiliesmc.org. Live domain is http://www.secretfamiliesmc.org. I only have one e-mail account set up info@secretfamiliesmc.org and the subdomain mirrors that e-mail. I have noticed that others have had issues with subdomains, but no clear answers.
Please help, thank you.
PS Before I got the WP SMPT Mail settings correct - I was using Contact Form 7 and have it set to sent 2 e-mails in response - one to the domain e-mail alerting of the post and one to the form sender. Contact Form 7 sent the email to my domain fine, but didn't receive anything at the form sender's email.
PSS After I got the WP SMPT Mail settings correct (as stated above)- I tried Contact Form 7 form again and the submit returned an error saying 'unfortunately we didn't receive your message'