Your hosting includes several layers of spam protection (server filters and optional StopSpam / SpamExperts quarantine).
To open SpamExperts, log in to cPanel, open the Email section, and click the SpamExperts icon/app (also labeled StopSpam/SpamExperts); you can also visit login.stopspam.ca.
Use a strong, unique mailbox password.
Review StopSpam quarantine for false positives.
Enable SPF, DKIM, and DMARC for outgoing reputation — see #2850.
Avoid catching all spam into a real inbox via an open catch-all.
If volume is extreme, open a ticket with examples (headers and timestamps).
Related: StopSpam guidance, authentication, and the email deliverability checklist.