[PLUG] SMTP Error Code Meaning

Rich Shepard rshepard at appl-ecosys.com
Fri Dec 11 17:25:27 UTC 2015


On Fri, 11 Dec 2015, Jim Garrison wrote:

> 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.

Jim,

   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.

   More investigation to follow.

Thanks,

Rich



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