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| Subject: | Re: Q about sender_dependent_relayhost_maps inbound vs outbound traffic |
| Group: | Postfix-users |
| From: | Victor Duchovni |
| Date: | 9 May 2008 |
> Example (simplified, prop. not correct syntax)
Simplified to the the point of being incomprehensible to anyone (including
yourself I suspect).
> sender_based_map
> internal-with-check.com:[next_hop_will_do_mx_lookup]
> internal.com: use mx
> *:all other use mx
What on earth does this mean. The sender table specifies a mapping between
a sender address and a relayhost, not a transport. Are you trying to
say that for senders in the domain on the LHS of the table entry below
the nexthop should be the RHS gateway when the recipient is delivered
using SMTP (rather than local)?
internal-with-check.com [next_hop_will_do_mx_lookup]
Does this system do *any* local delivery? Do any users submit mail
directly via sendmail(1) rather than via SMTP? If not, there is
not much difference betwen sender-dependent routing and a "FILTER
smtp:[next_hop...]" access check on the sender domain.
> recipient_map
> internal-with-check.com:[mymailserver.internal.com]
> internal.com:[mymailserver.internal.com]
> *:all other use mx
There is no "recipient map" there a transport table, whose syntax is
to select a transport and nexthop. Do make your examples more realistic.
> Mails :
>
> sender user to user
> should go to next_hop_will_do_mx_lookup, no recipient map applies
Is this because the domain in question is hosted on the gateway in
question, and all email from the domain should originate there, or
because you are considering misusing sender based routing to solve a
different problem that you have not explained?
Sender based routing is a SOHO feature, intended for machines with
perhaps a few local accounts and most user mailboxes hosted by an ESP.
> sender user to user
> should go to destination via mx, no recipient map applies
The documentation adequately describes this case.
The transport table is always checked, but there is certainly no
requirement to least every destination there.
> sender user to user
> should go to mymailserver.internal.com, no sender map applies
The documentation adequately covers this case.
> sender user to user
> should go to mymailserver.internal.com, no sender map applies
The documentation adequately covers this case.
There are likely more cases to consider. And your real motivation for
sender based routing left to describe.
--
Viktor.
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