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