The handling outside of a HELO,HELO appear to work correctly.  Setting the 
Postfix smtp-sink to return a soft bounce on DATA, for instance, presents 
to issues whatsoever.  Just HELO,EHLO.

Here's the full command line for the Postfix sink:
sudo /usr/sbin/smtp-sink -Q EHLO,HELO -u root -v 0.0.0.0:25 40


On Friday, July 1, 2016 at 2:17:58 PM UTC-6, Matthew Altman wrote:
>
> https://github.com/golang/go/blob/master/src/net/smtp/smtp.go#L76-L79
>
> This method can make two distinct SMTP calls. First an EHLO and then a 
> HELO.
> If the EHLO fails it attempts HELO. However, if the connection was closed 
> remotely after EHLO the HELO will of course also fail but the error message 
> returned will be a simple EOF from the HELO and the real response will be 
> dropped.
> This can be duplicated by sending to a postfix smtp-sink with the flag -Q 
> EHLO,HELO   which returns a 4xx response and disconnects.
>
> Since two separate calls are made, maybe it would make sense for this 
> method to return two errors? Or perhaps a single composite error?
>

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