On 08/12/2016 14:15, Dusan Obradovic wrote:
On Dec 8, 2016, at 14:57, Dominic Raferd <domi...@timedicer.co.uk> wrote:Thanks for your swift reply Dusan. What you write is logical but my postfix doesn't seem to behave that way. I have no special setting for maximal_queue_lifetime but I give below a recent extract from my log (obfuscated). After trying both gmail hosts and being pushed away with 421 4.7.0 it goes straight to the fallback relay ('relay.gridlock.net') with delay <=1s. This particular server has no relayhost set (but I see the same behaviour on another server which has).This is expected because smtp_fallback_relay behaves just like the additional lowest preference MX, meaning 4xx retries are spread over all MX (including smtp_fallback_relay), however 5xx is not retried and is a bounce.
OK thanks I understand now.
