Re: 550 after HELO

Philipp Ewald writes:

> Hello,
>
> I'm attempting to understand why we're not seeing any error messages in our  
> Courier mail log, despite knowing we're listed on a blacklist. We've noticed  
> there are no errors, which seems to be linked to the receiving server not  
> accepting the HELO command.

Well, what does show up in the logs?

> After issuing "HELO," our connection gets rejected. According to RFC 2821  
> 4.1.4, this shouldn't occur:
>
> "If the EHLO command is not acceptable to the SMTP server, failure replies  
> of 501, 500, or 502 MUST be returned as appropriate. The SMTP server MUST  
> remain in the same state after transmitting these replies as it was before  
> receiving the EHLO."
>
> It was mentioned to me that the receiving server uses Exim, which should  
> correctly handle this situation.
>
> Does anyone have insights into what might be happening here?

I expect Courier to handle that, and bounce the message normally. Courier  
doesn't care what the entire error code is. Only the first digit matters. If  
it's a 5, it's a hard error and it causes a bounce.

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