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@poetry should use /etc/mail/spamassassin/custom.cf

Spamassassin custom configuration. https://pmg.proxmox.com/pmg-docs/pmg-admin-guide.html#_custom_spamassassin_configuration uri __G_DRV /\/drive\.google\.com/i uri __ONE_DRV /\/onedrive\.live\.com/i meta CLOUD_SHARE ( __G_DRV || __ONE_DRV )...

Provide the spam mail in raw format.

If the default mail filter rule and SA score do not work for you. You have to create custom mail filter rule based on your situation and requirement. https://pmg.proxmox.com/pmg-docs/pmg-admin-guide.html#chapter_mailfilter Another option is custom spamassassin configuration...

The spam mail did not hit any of your custom score. SA score=1/5 time=1.435 bayes=0.00 autolearn=no autolearn_force=no...

From the log, the mail only have SA score of 1, did you apply any others custom mail filter rules beside the default setting?

To use PMG, you need to use PMG's IP as MX record for your domain.

Can you set MX record for domain rpihobby.us?

You using gmail or gsuite with your own email domain?

Maybe the exchange had been compromised or some compromised client sending spam through the exchange. Will the usage back to normal if you block or disable exchange outgoing connection to PMG?

Is there a lot of mail queuing? Is all the empty send from 192.168.1.80?

Run top or htop and show what is causing the high CPU and memory usage.

Is your IP blacklisted?

how about others emails from yahoo or hotmail?

Did you set the correct MX record in public DNS for your domain?

Create a highest priority rule with who object domain list. To bypass SPF checking, add the domain list to Mail Proxy -> Whitelist. But I am not sure will above setting bypass reject unknown sender/clients as I did not enable it.

Then pls mark thread as solved.

As I know the who object domain entry refer to Return-Path header field.

pls provide the password.

Pls attach the zip file for checking.