Currently, smtp_fallback_relay is being used after the first failed delivery.
http://www.postfix.org/postconf.5.html#smtp_fallback_relay explicitly mentions: "With bulk email deliveries, it can be beneficial to run the fallback relay MTA on the same host, so that it can reuse the sender IP address. This speeds up deliveries that are delayed by IP-based reputation systems (greylist, etc.)." i thought this could be done easier, like: Why not have either a smtp_fallback_relay_threshold parameter, which specifies after how many delivery attempts the mail will be passed to the smtp_fallback_relay. It would have to default to 1 to be backwards compatible. Alternative/additional approach: smtp_fallback_relay_threshold_time (compare to smtp_pix_workaround_threshold_time) How long a message must be queued before the Postfix SMTP client passes the mail to the smtp_fallback_relay. No idea what an appropriate default would be... -- [*] sys4 AG http://sys4.de, +49 (89) 30 90 46 64 Franziskanerstraße 15, 81669 München Sitz der Gesellschaft: München, Amtsgericht München: HRB 199263 Vorstand: Patrick Ben Koetter, Axel von der Ohe, Marc Schiffbauer Aufsichtsratsvorsitzender: Florian Kirstein
