There is no way to prevent someone to spoof your address. The sender information shown in e-mails (the From: field) can be spoofed easily. But usually, mail clients (like gmail) have logic to detect which email is spoofed or not.
Maybe your email account hosting been locked because you detected as a spoofer, to prevent this just use the email from field ...
SVG contains disallowed references
You can download on Agari's own BIMI logo, check file content and make sure that your one also looks similar ->
Insufficient DMARC Policy for BIMI
change "p=reject; pct=1; sp=none" to "p=reject". applying "reject" to 1% is not enough for ...