On 5/11/11 4:49 PM, David F. Skoll wrote:
Ah, ok.  We avoid issuing 4xx in response to a "RCPT" command because
quite a lot of badly-written SMTP software doesn't handle that well.

ie: qmail, postfix, exchange, sendmail, all (can) send a 4xx after rcpt to.

because thats what the RFC's say.



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