Ian Eiloart wrote:
On 7 Feb 2012, at 16:48, Antonio Leding wrote:
Hi Heiko,
Thanks very much for this information - so two more questions for
you and the community:
1) It seems that ACL is faster when compared to TRANSP?ORT - is
this true?
ACLs are Access Control Lists that chiefly determine whether you want
to accept, defer or reject the email. That's why you want to do your
SpamAssassin filtering here. It's also a good place to do malware
filtering, with ClamAV for example.
ACLs do have other purposes, though, such as passing information to
routers, transports, or your log file.
Routers determine how you're going to handle the message. But you
don't get to the router until the ACLs have decided that the message
is OK. The main purpose of your routers is to select a TRANSPORT to
do the actual delivery.
Transports do the actual delivery of your message, so they're the
last objects to handle the message. Transports might pass the message
to another mail server using SMTP or LMTP, or deliver it to a local
file that's accessible to an IMAP server, or something else. There
are lots of possibilities, and it's the ROUTERS that decide which
TRANSPORT to use.
2) Is Exim planning on removing the ability to perform the
TRANSPORT type of operation?
AFAIK, you don't have to have a transport in your Exim configuration,
but it would be unusual.
Technically true.
But with no routers or transports, eg: run 'queue_only' Exim DOES become
a 'collector and hoarder'.
It ordinarily wants another critter, or a separate Exim instance, to do
delivery FROM the queue.
Even leaving the queue as a dumping ground for on-box logfiles makes for
cumbersome parsing and fs bloat.
Bill
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