On Tue, 10 Mar 2026 at 14:10, Matus UHLAR - fantomas via Postfix-users
<[email protected]> wrote:
>
> I don't fully understand how you mean that.
> But I guess it would become more complicated than just using multi instance.
I ended up using sender_dependent_default_transport_maps to route
forwarded emails to a separate smtpd service in master.cf with its own
cleanup service defined.
It seems to work fine based on my simple tests.
Any reasons why it could be problematic?
main.cf:
# global reverse SRS
recipient_canonical_maps = socketmap:unix:srs:reverse
recipient_canonical_classes = envelope_recipient, header_recipient
# no global sender_canonical_maps, forward rewriting happens only in
srscleanup (master.cf)
sender_dependent_default_transport_maps =
pcre:/etc/postfix/checks/sender_nosrs.pcre
proxy:mysql:/etc/postfix/mysql/mysql-sender-nosrs.cf
static:srsfwd:[127.0.0.1]:10027
sender_nosrs.pcre - returns DUNNO for null sender, SRS domain and
system domains (mydestination)
mysql-sender-nosrs.cf - returns DUNNO for all virtual domains in
database (SELECTs based on %d)
master.cf:
# SRS for forwarded mail: srsfwd(smtp client) -> 127.0.0.1:10027 ->
srscleanup (postsrsd forward) -> smtp
srsfwd unix - - y - - smtp
-o syslog_name=postfix/srsfwd
-o smtp_tls_security_level=none
-o smtp_send_xforward_command=yes
-o disable_mime_output_conversion=yes
127.0.0.1:10027 inet n - y - - smtpd
-o syslog_name=postfix/srsfwd-in
-o cleanup_service_name=srscleanup
# loop guard: re-injected mail always goes out via smtp, bypassing
sender_dependent_default_transport_maps
-o content_filter=smtp:
-o receive_override_options=no_unknown_recipient_checks,no_milters
-o smtpd_milters=
# keep headers untouched so the original DKIM signature stays valid
-o local_header_rewrite_clients=
-o smtpd_client_restrictions=
-o smtpd_helo_restrictions=
-o smtpd_sender_restrictions=
-o smtpd_relay_restrictions=
-o smtpd_recipient_restrictions=permit_mynetworks,reject
-o mynetworks=127.0.0.0/8
-o smtpd_authorized_xforward_hosts=127.0.0.0/8
-o smtpd_tls_security_level=none
-o smtpd_error_sleep_time=0
-o smtpd_soft_error_limit=1001
-o smtpd_hard_error_limit=1000
srscleanup unix n - y - 0 cleanup
-o syslog_name=postfix/srscleanup
-o sender_canonical_maps=socketmap:unix:srs:forward
-o sender_canonical_classes=envelope_sender
-o recipient_canonical_maps=
-o virtual_alias_maps=
-o header_checks=pcre:/etc/postfix/checks/srs_header_checks.pcre
-o mime_header_checks=
-o nested_header_checks=
-o body_checks=
srs_header_checks.pcre - removes X-Spamd-Result
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