>> 300 is not a standard code. The real error code was 554 (earlier in the
>> message). I don't know about other MTAs but in Postfix when you
>> configure  reject reasons you can put any text in the message at that
point.
>> The '300' is probably meaningful only to whoever set up the server.
>
>  I suspected that. But, it's the recipient's address rather than the
> sender's address that's rejected and I know they're still at those
> domains.
>

Not necessarily. It's just telling you who the email was addressed to.
It could be rejected because the mail server didn't like you.


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