501 Error when trying to send via smtp outbound mail proxy

I need a solution

When trying to send email via Encryption Server outbound SMTP proxy, the following error occurs:

helo host
250 crypto.coyote.com
mail from: will@coyote.com
501 Syntax error in parameters or arguments

The same error appears when trying to send inbound mail via smtp inbound proxy. What am I missing? Best

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