Andreas, thanks for the suggestion. if first_delivery then ... endif
definitely improved things. if $message_headers contains "\nX-old-from:" then ... else headers add "X-old-from: $header_from:" headers remove "From" headers add "From: <${address:$header_X-old-from:}>" endif is even better in my environment. I considered adding a "headers_remove X-old-from" to the local delivery transport, but was surprised (my ignorance) to discover that the system filter executes first. Also, a thank-you to the implementers of exim_lock, which made testing easier. Ken -----Original Message----- From: Exim-users [mailto:exim-users-bounces+kjohnson=eclypse....@exim.org] On Behalf Of exim-users@exim.org Sent: Friday, April 23, 2021 9:22 AM To: exim-users@exim.org Subject: Re: [exim] 'failed to lock' delivery deferral breaks system filter for me On 2021-04-23 Ken via Exim-users <exim-users@exim.org> wrote: [...] > I manage the email server for a small company in the US. Less than 1000 > received messages per day. A month or two ago I put in place a simple exim > system filter that removes the 'Friendly Name' from the From: header. > headers add "X-old-from: $header_from:" > headers remove "From" > headers add "From: <${address:$header_X-old-from:}>" > This works well most of the time and has had good acceptance from the user > community as part of anti-phishing efforts. > However, if delivery is deferred to one recipient because of a lock failure > (example follows) then the final line of the filter does not execute > correctly, and more than one (perhaps all) recipients receive a message with > an empty From: header. > ... defer (-9): failed to lock mailbox /var/mail/redacted (fcntl/flock) > A pointer to a fix or workaround would be lovely; my current best > alternative is to switch from mbox to maildir to reduce the frequency of > delivery deferrals. Hello, try wrapping the whole thing in if first_delivery then endif cu Andreas -- ## List details at https://lists.exim.org/mailman/listinfo/exim-users ## Exim details at http://www.exim.org/ ## Please use the Wiki with this list - http://wiki.exim.org/ -- ## List details at https://lists.exim.org/mailman/listinfo/exim-users ## Exim details at http://www.exim.org/ ## Please use the Wiki with this list - http://wiki.exim.org/