SpamExperts on shared hosting blocking my own outgoing email

How to disable, bypass or whitelist

[Kickedout]

Moved to a shared hosting time ago. They use SpamExperts. I have a standard email with text and pictures that I send to people asking me for certain service. So basically I manually send that email (using my email client) one by one.
However that particular email seems to be bounced I guess not by the recipent, but for the outgoing control of SpamExperts (which I never asked for)

And email bounced says something like

host outbound.mailspamprotection.com [ip number here]
SMTP error from remote mail server after end of data:
550 High probability of spam

The thing is the email is not spam, and my attempts for modifying itīs content doesnīt make my email to bypass that hated outgoing filter. Thereīs no way I can "train" or whitelist in spamexperts and techincal support is not helping me.

I see you can "train" good or bad incoming email in SE, but not outgoing email.

How to disable, bypass or whitelist my own email in order to be sent?

[Andy Langton]

If you send a plain text, no commercial keyword type email, do you still get filtered? This might help in figuring out whether it's actually the content or something else that's the issue.

Otherwise, just use an external SMTP server for delivery, and skip the system altogether.

[tangor]

Also check to see if the mail server is DMARC compliant, does NOT execute open relay and, hopefully, TLS, too.