Hi all,
Short version: in a simple mailing-list setup, how should I rewrite the
sender address so that emails to the list are then re-sent from the list
address?
Longer version:
I'm running a simple virtual-mailbox setup with Exim, where domain and
user details are stored in a PostgreSQL database. This is on an AWS host
(Lightsail), and uses Amazon SES as a smarthost for outgoing email. All
is working fine so far.
I now need to add what are effectively simple mailing lists - email
addresses which will forward to multiple recipient addresses, mostly
outside the domains handled by our setup. I've added a router (appennded
below) based on an example in the Exim book, which checks whether an
incoming email is for a list address, and - if it is - redirects to the
list members. So far so good.
Now, I need to rewrite the "From" header to the list address, so that
SES will send out the emails to the list recipients. How should I do
this? It doesn't seem to be possible to use headers_rewrite in a router
(I tried and got an error). One thing I thought of was to create a
separate transport which checks for the presence of a List-ID header
(which is added in the router, and contains just the list address), and
changes the "From" address to its value using headers_rewrite - would
this be a viable approach?
On the same topic, is there anything else I should be doing? This isn't
a full-blown mailing list solution - we just need a small number (5-10)
of group addresses, each going to a small number (<20) of recipients -
but I want to do it right.
Here's my router as it stands (yes, I know there are more DB lookups
than I need - it's a work in progress):
vmail_maillist:
debug_print = "R: vmail_maillist for $local_part@$domain"
driver = redirect
condition = ${lookup pgsql{ select 'true' from mailing_lists where
is_enabled = true \
and list_name = '${quote_pgsql:$local_part}' and domain_name =
'${quote_pgsql:$domain}'}}
data = ${lookup pgsql{ select recipient from mailing_list_recipients
where \
list_name = '${quote_pgsql:$local_part}' and domain_name =
'${quote_pgsql:$domain}' }}
# Get the list address as a variable, to save on lookups.
set = r_list_address = ${lookup pgsql{ select list_name || '@' ||
domain_name from mailing_lists \
where list_name = '${quote_pgsql:$local_part}' and domain_name =
'${quote_pgsql:$domain}' }}
# Remove any DKIM header, as the outgoing emails get signed by SES.
headers_remove = DKIM-signature
# Add the list ID.
headers_add = "List-ID: $r_list_address"
forbid_pipe
forbid_file
no_more
Very many thanks in advance,
Ray O'Donnell.
--
Raymond O'Donnell // Galway // Ireland
ray@???
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