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    @RuiFRibeiro Interesting. I've confirmed this just now and updated my answer. Commented Jul 26, 2017 at 21:15
  • nonsense. a big part of the point of an email alias is that the alias DOESN'T have to exist as a user on the mail server. I have dozens and dozens of aliases on my mail server (each one created for a different web site, mailing list, company, or other organisation that wants an email address for me), none of them exist as a user and all look like alias: cas or alias: cas+alias (to make it easier to process with procmail). Commented Jul 26, 2017 at 21:22
  • that's not what @Alxs wrote ("OR. Add a user named users"). and it's not true, either. an alias can point to a remote email address, or to another alias. it can also point to a non-existent local user (in which case, will bounce or be rejected). if an alias has multiple recipients, delivery will be attempted to all of them - and if any don't exist, only they will bounce. Commented Jul 26, 2017 at 21:27
  • I agree with cas, what's the point of the alias then? I mean, if I have an alias: user: user, user1, how can I send the email just to user without sending it to user1? Commented Jul 26, 2017 at 22:41
  • Just so you know, I changed my aliases to user: user1 then I ran postalias restarted the postfix service and when I send the email to user it gets send to user not to user1 Commented Jul 26, 2017 at 23:02