That's his internal blacklist. Usually means he's seen spam from your ASN.
You could try submitting a delist via https://esf.mxroute.com as per
https://smtp.codes/mxroute/ but I've also pinged him on the side on a group I'm
in with him.
-------- Original Message --------
On Wednesday, 03/11/26 at 04:46 Scott Q. via mailop <[email protected]> wrote:
> I apologize for the public contact but direct messages to Jarland are also
> bouncing.
>
> Jarland, can you check why your servers are blocking messages from
> 65.39.216.0/25 , 69.172.250.0/24 , 66.179.84.0/24 ? Bounce says:
>
> 45.43.208.31 does not like recipient.
> Remote host said: 550 Unauthenticated mail not allowed from this range to
> protected domain
> Giving up on 45.43.208.31.
>
> That's when I tried e-mailing you to inquire about some customers of ours
> receiving similar messages. We obviously have SPF/DKIM enabled...
>
> Thanks!
> Scott
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