On 4/5/2011 3:35 PM, email builder wrote:
Here is what I've done with the typo corrected. Is this a Bad
Idea? Are there problems with naively using the domain from the
recipient email address as the
nexthop value?
master.cf:
smtp2 unix - - n - - smtp
-o smtp_bind_address=bbb.bbb.bbb.bbb
127.0.0.1:10024 inet n - n - - smtpd
-o content_filter=
-o
receive_override_options=no_unknown_recipient_checks,no_header_body_checks
-o smtpd_helo_restrictions=
-o smtpd_client_restrictions=
-o smtpd_sender_restrictions=
-o smtpd_recipient_restrictions=permit_mynetworks,reject
-o
smtpd_data_restrictions=check_recipient_access,pcre:/etc/postfix/send_to_smtp2
-o smtpd_end_of_data_restrictions=
-o smtpd_restriction_classes=
-o mynetworks=127.0.0.0/8
/etc/postfix/send_to_smtp2:
/@(.+)/ FILTER smtp2:$1
This sends all mail to transport "smtp2". If that is what you want,
then you can get a better result with "default_transport = smtp2",
You can get a simpler result by adding "-o smtp_bind_address..."
to the default "smtp" delivery transport.
Sorry, the smtpd listener on port 10024 only gets *some* of the mail on the
server. There is another smtpd listener on a different port that I didn't show
that does not use the "smtp2" process to send mail. Thus, only the mail that I
route into the smtpd listener on port 10024 is sent via the IP address
bbb.bbb.bbb.bbb.
So it does seem possible (and reasonably simple) to achieve this feature, but
I'm still keen to know if there are any Bad Ideas lurking with this scheme.
Some problems lurking in the shadows ...
Routing mail with smtpd_recipient_restrictions and FILTER will
give inconsistent results with multi-recipient mail. The
FILTER action is a per-message setting -- the last recipient
domain sent will be the one filtered on. Using a transport
table and multiple postfix instances is the only reliable
solution.
In smtpd_data_restrictions, multiple recipients are undefined.
If the message contains multiple recipients, no recipients
information will be available in smtpd_data_restrictions.
-- Noel Jones
