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Sometimes Outlook users send email through our Postfix mail server with malformed "to" field, with quotes in it:

'recipient@domain.com'

and Postfix writes "warning: Illegal address syntax" error in logs, but it does not send a non delivery notification. But if I send an email to a malformed address from command line on Postfix server, root user receives the non delivery notification. Is it possible to notify a remote sender, too?

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FYI I asked on Postfix mailing list and the answer is:

No. When an SMTP server does not accept a message, it is the responsibility of the SMTP client to inform the sender that email was not accepted.

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