When sending lots of mails (mass mailings) via many machines, one
quickly realizes that the current concept of smtp_fallback_relay is
a bit problematic:
* The mass mailing gets (randomly) distributed to n machines
* these n machines try sending out the mails assigned to them and will
encounter mechanisms like postscreen or greylisting mechnisms
* thus the initial delivery fails
* the mail gets passed to the smtp_fallback_relay
I wonder if a time based smtp_fallback_relay ("pass the mail to the
smtp_fallback_relay after a certain period of time has expired") or
using the smtp_fallback_relay after a certain number of delivery
attempts (>=1) would be a worthwile addition to Postfix.
Something like
smtp_fallback_relay_delivery_threshold = 1
would be backwards compatible to the current behaviour, while allowing
the admin to specify
smtp_fallback_relay_delivery_threshold = 2
or even
smtp_fallback_relay_delivery_threshold = 3
which would allow a machine to "defeat" greylisting, while still using
smtp_fallback_relay for the "tough cookies".
Thoughts?
--
Ralf Hildebrandt
Geschäftsbereich IT | Abteilung Netzwerk
Charité - Universitätsmedizin Berlin
Campus Benjamin Franklin
Hindenburgdamm 30 | D-12203 Berlin
Tel. +49 30 450 570 155 | Fax: +49 30 450 570 962
ralf.hildebra...@charite.de | http://www.charite.de
