No apologies necessary.
here is the level 4 debug
Connection: opening to mail.s483.sureserver.com:587, timeout=5, options=array ()
Connection: opened
SMTP -> get_lines(): $data is ""
SMTP -> get_lines(): $str is "220 s483.sureserver.com ESMTP"
SERVER -> CLIENT: 220 s483.sureserver.com ESMTP
CLIENT -> SERVER: EHLO rplcnm.org
SMTP -> get_lines(): $data is ""
SMTP -> get_lines(): $str is "250-s483.sureserver.com"
SMTP -> get_lines(): $data is "250-s483.sureserver.com"
SMTP -> get_lines(): $str is "250-STARTTLS"
SMTP -> get_lines(): $data is "250-s483.sureserver.com250-STARTTLS"
SMTP -> get_lines(): $str is "250-PIPELINING"
SMTP -> get_lines(): $data is "250-s483.sureserver.com250-STARTTLS250-PIPELINING"
SMTP -> get_lines(): $str is "250-8BITMIME"
SMTP -> get_lines(): $data is "250-s483.sureserver.com250-STARTTLS250-PIPELINING250-8BITMIME"
SMTP -> get_lines(): $str is "250-SIZE 0"
SMTP -> get_lines(): $data is "250-s483.sureserver.com250-STARTTLS250-PIPELINING250-8BITMIME250-SIZE 0"
SMTP -> get_lines(): $str is "250 AUTH LOGIN PLAIN CRAM-MD5"
SERVER -> CLIENT: 250-s483.sureserver.com250-STARTTLS250-PIPELINING250-8BITMIME250-SIZE 0250 AUTH LOGIN PLAIN CRAM-MD5
CLIENT -> SERVER: STARTTLS
SMTP -> get_lines(): $data is ""
SMTP -> get_lines(): $str is "220 ready for tls"
SERVER -> CLIENT: 220 ready for tls
CLIENT -> SERVER: EHLO rplcnm.org
SMTP -> get_lines(): $data is ""
SMTP -> get_lines(): $str is "250-s483.sureserver.com"
SMTP -> get_lines(): $data is "250-s483.sureserver.com"
SMTP -> get_lines(): $str is "250-PIPELINING"
SMTP -> get_lines(): $data is "250-s483.sureserver.com250-PIPELINING"
SMTP -> get_lines(): $str is "250-8BITMIME"
SMTP -> get_lines(): $data is "250-s483.sureserver.com250-PIPELINING250-8BITMIME"
SMTP -> get_lines(): $str is "250-SIZE 0"
SMTP -> get_lines(): $data is "250-s483.sureserver.com250-PIPELINING250-8BITMIME250-SIZE 0"
SMTP -> get_lines(): $str is "250 AUTH LOGIN PLAIN CRAM-MD5"
SERVER -> CLIENT: 250-s483.sureserver.com250-PIPELINING250-8BITMIME250-SIZE 0250 AUTH LOGIN PLAIN CRAM-MD5
Auth method requested: UNKNOWN
Auth methods available on the server: LOGIN,PLAIN,CRAM-MD5
Auth method selected: CRAM-MD5
CLIENT -> SERVER: AUTH CRAM-MD5
SMTP -> get_lines(): $data is ""
SMTP -> get_lines(): $str is "334 PDE4OTMxLjE0NzE4NjIwNzRAc210cC5zdXJlc2VydmVyLmNvbT4="
SERVER -> CLIENT: 334 PDE4OTMxLjE0NzE4NjIwNzRAc210cC5zdXJlc2VydmVyLmNvbT4=
CLIENT -> SERVER: cG9zdG1hc3RlckBycGxjbm0ub3JnIDkxMjgzNTgwMjRlNTA0ZDdmOWE3YjE1NGJlMzNmYTEw
SMTP -> get_lines(): $data is ""
SMTP -> get_lines(): $str is ""
SMTP -> get_lines(): timed-out (5 sec)
SERVER -> CLIENT:
SMTP ERROR: Username command failed:
SMTP Error: Could not authenticate.
CLIENT -> SERVER: QUIT
SMTP -> get_lines(): $data is ""
SMTP -> get_lines(): $str is "235 ok, go ahead (#2.0.0)"
SERVER -> CLIENT: 235 ok, go ahead (#2.0.0)
SMTP ERROR: QUIT command failed: 235 ok, go ahead (#2.0.0)
Connection: closed
SMTP connect() failed. https://github.com/PHPMailer/PHPMailer/wiki/Troubleshooting