On Mon, Nov 06, 2023 at 11:55:44AM +0100, lejeczek via Postfix-users wrote:
> I'm thinking having each box's root I'd forward to _allmail@my.private_ -
> probably it's how many, if not everybody, do it.
> Here, my 'allmail' is a user which exists, via Dovecoto auth, on all boxes.
> What I struggle to wrap my head around, how, since I have:
> ...
> mydestination = $myhostname, localhost.$mydomain, localhost, $mydomain
> ...
> is, how to have Postfix mail to that one MX for this local 'my.private'
> domain.
The best-practice way to deliver mail addressed to one logical recipient
to two (or more) separate mailboxes is to use virtual(5) aliases:
virtual:
root root@local.invalid, someuser@foo.example
This assumes:
- Only "local.invalid" is listed in $mydestination
- $myorigin is the same on all hosts, and expands to a shared
logical mail domain.
- Neither $myorigin, nor its expanded value, is listed in $mydestination
- A relayhost is defined to point at the internal mailhub
("smarthost") which knows how to deliver for all valid addresses
in the shared domain.
main.cf:
indexed = ${default_database_type}:${config_directory}/
mydomain = foo.example
myorigin = foo.example
mydestination = local.invalid
relayhost = [mail.foo.example]
virtual_alias_maps = ${indexed}virtual
alias_database = ${indexed}aliases
alias_maps = $alias_database
# Maildir delivery, see local(8)
mail_spool_directory = /var/spool/mail/
# Or
# mailbox_transport = lmtp:unix:...
# Or skip local aliases(5) entirely:
# local_transport = lmtp:unix:...
# local_transport = virtual (with suitable virtual_mailbox_maps,
# virtual_uid_maps, ...)
aliases:
postmaster: root
bin: root
...
Basically, use as little of the legacy Sendmail-compatible behaviour of
local(8) as you can:
- Avoid 1-to-many aliases(5) expansion
- Avoid delivery to command pipes
- Avoid .forward files
- ...
Use at most:
- One-to-one delivery to a mailbox, or preferrably a maildir
- Or better, just deliver directly to an LMTP server or via
virtual(8).
The main useful feature of local(8) that is best exercised on the
mailhub is support for mailing lists via ":include:", owner-alias
mappings, ... But you should not need this null client end hosts.
Speaking of "null clients", see also MULTI_INSTANCE_README.
--
Viktor.
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