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Topic: Cannot send protonmail

==== REQUIRED BASIC INFO OF YOUR IREDMAIL SERVER ====
- iRedMail version :1.6.3
- Deployed with iRedMail Easy or the downloadable installer?: downloadable
- Linux/BSD distribution name and version: Ubuntu22.04
- Store mail accounts in which backend (LDAP/MySQL/PGSQL): MariaDB
- Web server (Apache or Nginx): Nginx
- Manage mail accounts with iRedAdmin-Pro? :No
====

Good evening.
When I built a mail server and tried sending a message to Protonmail, "host mail.protonmail.ch[185.70.42.128] said: 554 5.7.1 rejected by rspamd filter (in reply to end of DATA command)" I returned.
How can I send mail without being blocked by rspam?

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