[Dovecot] Using Dovecot-auth to return error code 450 (or other 4xx) to Postfix when user is on vacation

[IVO GELOV (CRM)]

On Sun, 15 Jan 2012 23:36:48 +0200, Mark Sapiro <mark at msapiro.net> wrote:

> IVO GELOV (CRM) wrote:
>
>> I still think that my idea with custom error codes is more useful - if the user is
>> on vacation, the message is rejected immediately (no auto-reply is sent) and sender
>> can see (hopefully, because most users just ignore error messages) the reason why
>> the messages was rejected.
>
>
> A 4xx status will not do this. It should just cause the sending MTA to
> keep the message queued and keep retrying. Depending on the sending
> MTA's retry and notification policies, the sender may see no error or
> delay notification for several days.
>
> If you really want the sender to immediately see a rejection, you have
> to use a 5xx status.
>

Yes, you are right. The error code is the smallest difficulty :)