K K:
> Hi all,
> 
> are there any possibilities to check multiple recipients based on
> check_recipient_access restriction ?

As documented, smtpd_recipient_strictions is invoked once for each
RCPT TO command. 

If you allow X to send email to A or B but disallow multiple
recipients, then X can easily work around that by sending
single-recipient mail. Alternatively, X could just send through
qmail, which always sends single-recipient mail.

If you still want to do complex logic, then it will need to be done
with the SMTPD policy delegation protocol.

        Wietse

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