Emails stopped flowing on Oct. 5

I had GMail SMTP set up and working fine through late in the day on Oct. 5. I’m pretty certain I did not make any changes on that date. There was a server move on Sept. 22, but that was almost two weeks prior to the problem.

When sending a test message, this is what I get. Can you provide any insight or help?

Also, do you have any documentation on how to COMPLETELY remove the plugin, all information and clear/delete the connection with GMail? I wanted to try a complete wipe and start completely over with this plugin to see if it was a setting issue or a reset, but I could not seem to remove everything on the WP AND the Google side.

Here is the log…

2017-10-10 06:56:11 Connection: opening to smtp.gmail.com:587, timeout=300, options=array ()
2017-10-10 06:56:11 Connection: opened
2017-10-10 06:56:11 SMTP -> get_lines(): $data is ""
2017-10-10 06:56:11 SMTP -> get_lines(): $str is "220-host3.spidercreations.net ESMTP Exim 4.89 #1 Tue, 10 Oct 2017 02:56:11 -0400 "
2017-10-10 06:56:11 SMTP -> get_lines(): $data is "220-host3.spidercreations.net ESMTP Exim 4.89 #1 Tue, 10 Oct 2017 02:56:11 -0400 "
2017-10-10 06:56:11 SMTP -> get_lines(): $str is "220-We do not authorize the use of this system to transport unsolicited, "
2017-10-10 06:56:11 SMTP -> get_lines(): $data is "220-host3.spidercreations.net ESMTP Exim 4.89 #1 Tue, 10 Oct 2017 02:56:11 -0400 220-We do not authorize the use of this system to transport unsolicited, "
2017-10-10 06:56:11 SMTP -> get_lines(): $str is "220 and/or bulk e-mail."
2017-10-10 06:56:11 SERVER -> CLIENT: 220-host3.spidercreations.net ESMTP Exim 4.89 #1 Tue, 10 Oct 2017 02:56:11 -0400 220-We do not authorize the use of this system to transport unsolicited, 220 and/or bulk e-mail.
2017-10-10 06:56:11 CLIENT -> SERVER: EHLO grayguns.com
2017-10-10 06:56:11 SMTP -> get_lines(): $data is ""
2017-10-10 06:56:11 SMTP -> get_lines(): $str is "250-host3.spidercreations.net Hello grayguns.com [64.91.229.6]"
2017-10-10 06:56:11 SMTP -> get_lines(): $data is "250-host3.spidercreations.net Hello grayguns.com [64.91.229.6]"
2017-10-10 06:56:11 SMTP -> get_lines(): $str is "250-SIZE 52428800"
2017-10-10 06:56:11 SMTP -> get_lines(): $data is "250-host3.spidercreations.net Hello grayguns.com [64.91.229.6]250-SIZE 52428800"
2017-10-10 06:56:11 SMTP -> get_lines(): $str is "250-8BITMIME"
2017-10-10 06:56:11 SMTP -> get_lines(): $data is "250-host3.spidercreations.net Hello grayguns.com [64.91.229.6]250-SIZE 52428800250-8BITMIME"
2017-10-10 06:56:11 SMTP -> get_lines(): $str is "250-PIPELINING"
2017-10-10 06:56:11 SMTP -> get_lines(): $data is "250-host3.spidercreations.net Hello grayguns.com [64.91.229.6]250-SIZE 52428800250-8BITMIME250-PIPELINING"
2017-10-10 06:56:11 SMTP -> get_lines(): $str is "250-AUTH PLAIN LOGIN"
2017-10-10 06:56:11 SMTP -> get_lines(): $data is "250-host3.spidercreations.net Hello grayguns.com [64.91.229.6]250-SIZE 52428800250-8BITMIME250-PIPELINING250-AUTH PLAIN LOGIN"
2017-10-10 06:56:11 SMTP -> get_lines(): $str is "250-STARTTLS"
2017-10-10 06:56:11 SMTP -> get_lines(): $data is "250-host3.spidercreations.net Hello grayguns.com [64.91.229.6]250-SIZE 52428800250-8BITMIME250-PIPELINING250-AUTH PLAIN LOGIN250-STARTTLS"
2017-10-10 06:56:11 SMTP -> get_lines(): $str is "250 HELP"
2017-10-10 06:56:11 SERVER -> CLIENT: 250-host3.spidercreations.net Hello grayguns.com [64.91.229.6]250-SIZE 52428800250-8BITMIME250-PIPELINING250-AUTH PLAIN LOGIN250-STARTTLS250 HELP
2017-10-10 06:56:11 CLIENT -> SERVER: STARTTLS
2017-10-10 06:56:11 SMTP -> get_lines(): $data is ""
2017-10-10 06:56:11 SMTP -> get_lines(): $str is "220 TLS go ahead"
2017-10-10 06:56:11 SERVER -> CLIENT: 220 TLS go ahead
2017-10-10 06:56:11 Connection failed. Error #2: stream_socket_enable_crypto(): Peer certificate CN=<code>host3.spidercreations.net' did not match expected CN=</code>smtp.gmail.com' [/home/grayguns/public_html/wp-content/plugins/gmail-smtp/PHPMailer/class.smtp.php line 370]
SMTP Error: Could not connect to SMTP host.
2017-10-10 06:56:11 CLIENT -> SERVER: QUIT
2017-10-10 06:56:12 SMTP -> get_lines(): $data is ""
2017-10-10 06:56:12 SMTP -> get_lines(): $str is "221 host3.spidercreations.net closing connection"
2017-10-10 06:56:12 SERVER -> CLIENT: 221 host3.spidercreations.net closing connection
2017-10-10 06:56:12 Connection: closed
SMTP connect() failed. https://github.com/PHPMailer/PHPMailer/wiki/Troubleshooting