Error due to unsolicited and/or bulk e-mail.

Hello,

I have a form on my site that has been working well until this morning. I am hoping to resolve this issue and get the form sending emails again. Thank you for any help!

Debug below:

Versions:
WordPress: 5.1.1
WordPress MS: No
PHP: 5.6.35
WP Mail SMTP: 1.4.1

Params:
Mailer: smtp
Constants: No
ErrorInfo: SMTP connect() failed. https://github.com/PHPMailer/PHPMailer/wiki/Troubleshooting
Host: smtp.office365.com
Port: 587
SMTPSecure: tls
SMTPAutoTLS: bool(true)
SMTPAuth: bool(true)

Server:
OpenSSL: OpenSSL 1.0.1e-fips 11 Feb 2013
SMTP Debug:

2019-03-21 17:00:26 Connection: opening to smtp.office365.com:587, timeout=300, options=array (
)
2019-03-21 17:00:26 Connection: opened
2019-03-21 17:00:26 SERVER -> CLIENT: 220-bizcloud30.asoshared.com ESMTP Exim 4.91 #1 Thu, 21 Mar 2019 13:00:26 -0400
220-We do not authorize the use of this system to transport unsolicited,
220 and/or bulk e-mail.
2019-03-21 17:00:26 CLIENT -> SERVER: EHLO claritycannabisportal.ca
2019-03-21 17:00:26 SERVER -> CLIENT: 250-bizcloud30.asoshared.com Hello claritycannabisportal.ca [23.91.70.152]
250-SIZE 52428800
250-8BITMIME
250-PIPELINING
250-AUTH PLAIN LOGIN
250-STARTTLS
250 HELP
2019-03-21 17:00:26 CLIENT -> SERVER: STARTTLS
2019-03-21 17:00:26 SERVER -> CLIENT: 220 TLS go ahead
2019-03-21 17:00:26 SMTP Error: Could not connect to SMTP host.
2019-03-21 17:00:26 CLIENT -> SERVER: QUIT
2019-03-21 17:00:26 SERVER -> CLIENT: I??{??X?On??Q??G?+??.?17221 bizcloud30.asoshared.com closing connection
2019-03-21 17:00:26 SMTP ERROR: QUIT command failed: I??{??X?On??Q??G?+??.?17221 bizcloud30.asoshared.com closing connection
2019-03-21 17:00:26 Connection: closed
2019-03-21 17:00:26 SMTP connect() failed. https://github.com/PHPMailer/PHPMailer/wiki/Troubleshooting