> I think it's caused by the recipient being invalid, at least thats
what 
> the logs indicate. I could be wrong.

I do too. I had the same error (a 503 error, but different textual
response. Mine was "Bad sequence of commands. [SMTP Error Code 503]")

For me, the server that sits behind ASSP was misconfigured (typo) on the
allowed domains, such that when I tested a new domain, I got that
unusual bounce/error report. Since I knew ASSP was working correctly, I
started looking on the SMTP gateway behind ASSP and found the typo. I
assumed that the SMTP gateway was preventing normal SMTP flow, or ASSP
was trying to proxy commands despite the gateway denying.

Either way - it *was* due to invalid recipient (domain) in my case.

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