Gordon Messmer writes:

On 04/11/2016 12:22 PM, Jeff Potter wrote:
> Gordon, could one potentially change the replies after the first RCPT TO to 4xx responses, to ensure the incoming message is being delivered to exactly one user?

Not exactly.  Courier's mail filtering API only issues one call, after
the body is available.  There's a separate API to run users' mail
filters with maildrop's embedded mode, but unlike Sendmail's milter API,
Courier's API isn't available at every stage of the SMTP conversation.

maildrop's embedded mode runs for RCPT TO, and DATA commands. Additionally, when using the embedded in the default configuration, Courier will defer, using 4xx, recipients that do not have the embedded mode filter activated.


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