Wietse:
>> # transport
>> example.com  defer:
>
> example.com  retry:
>
> (the defer service does not spe[a]k the "delivery agent" protocol).

Roberto Carraro:
> I didn't get the difference between the two; I did see that both are 
> effective in sticking mails in the mail queue.

The incorrect solution results in Postfix error messages in the
maillog file.

There is no Postfix support to hold/release one recipient in the
queue.  You can hold/release only messages with all their recipients.

        Wietse

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