Simon Capstick wrote:
...
>
> I'm using Exim 4.5 on all our MTAs, and there's no simple parameter to
> redirect the recipient callout (from MX MTA directly to the internal
> MTA). I'm not an Exim guru so there may a kludge that I could do.
> Maybe I should switch to Postfix instead :-) I'll follow the Amavis
> docs on how to combine Amavis and Exim.
>
> Instead of just having Amavis in between the MTAs, as I do now, I'll try
> to have both Amavis and Exim.
>
> -->Firewall--->MX MTA---\ +---------------+
> |--->| Exim + Amavis |--->Internal MTA
> -->Firewall--->MX MTA---/ +---------------+
>
> Hopefully I can then allow recipient callouts along the whole chain of
> MTAs before Amavis does it's thing. I'll make sure that each MTA
> accepts any address (local part) in the event of the next MTA in the
> chain not being contactable, so nothing important bounces during
> maintenance/down time.
>
> Simon
>
I finally found out how to redirect those callout verifications from
Exim. For future reference this is how I did it...
I had to create a new router in Exim's config and place it at the top of
the routers list, before amavis' router:
###################################################################
# It's important that this router is refined if we start any other
# callouts/verifications other than recipient callouts to just our
# domain.
callout:
debug_print = "Initiating recipient callout to my mail host..."
driver = manualroute
verify_only
transport = recipient_callout
route_list = * myinternal-mailhost.example.com byname
host_find_failed = defer
###################################################################
Note: I created my own transport (recipient_callout) but this probably
wasn't necessary:
###############################
# The transport ...
recipient_callout:
driver = smtp
port = 25
###############################
The acl containing the verify command was as follow:
######################################################
drop
!acl = acl_whitelist_local_deny
domains = example.com
# Local recipient so make a callout
debug_print = "Initiating recipient callout..."
!verify = recipient/callout=60s,use_sender,defer_ok
#######################################################
Hope this helps any Exim4 newbies like me :-)
Simon
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