A DSN *is* a standard bounce.

--
Shmuel (Seymour J.) Metz
http://mason.gmu.edu/~smetz3


________________________________________
From: IBM Mainframe Discussion List <[email protected]> on behalf of 
Grant Taylor <[email protected]>
Sent: Friday, August 28, 2020 11:51 AM
To: [email protected]
Subject: Re: Sending email from the Mainframe

On 8/28/20 7:36 AM, Paul Gilmartin wrote:
> The inability to handle Delivery Status Notifications is a glaring
> deficiency of CSSMTP, worthy of an RFE to repair this regression.

DSNs / MDNs / other non-standard bounces don't need to come back into
CSSMTP.  The just need to come back into an SMTP server.  It can be any
SMTP server, including the main corporate SMTP server.

It is entirely possible to send messages from CSSMTP and have the
bounces go back to a different server, and then collect bounces or
otherwise process them there.

> Might this be partly mitigated by supplying an "Errors-to:" header?

Unnecessary.

> Was security a motivator for ending support of incoming mail,
> possibly because DSNs often reproduce the entire, possibly
> sensitive, email bodies?

You can influence what is returned by using the optional "RET=HDRS"
parameter to the MAIL FROM statement.  Standards compliant servers
should only return the headers and not the message body.



--
Grant. . . .
unix || die

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