SMTP relay that allows wildcard subdomains
My ISP unexpectedly stopped permitting SMTP relay of non-ISP domain names, after 22 years.
I have a wildcard subdomain MX entry in my DNS, such that sending/receiving *.example.com are valid.
I do this so I can email from a email address, say [me@reddit.example.com](mailto:me@reddit.example.com) , tailored to the recipient. Great for knowing who leaks my email address, and can even create a MX record for that subdomain and point it to 127.0.0.1 so the spam never even gets to me if I wish.
So now I'm looking for a low volume STMP relay service, that will of course verify I own my domain name, but doesn't require me to manually add each subdomain (of which there are countless).
Any recommendations?
Thanks!
edit: only looking for outbound relay - I'd still be receiving/hosting inbound directly.
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