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List:       exim-users
Subject:    Re: [exim] 'failed to lock' delivery deferral breaks system filter for me
From:       Ken via Exim-users <exim-users () exim ! org>
Date:       2021-04-27 18:06:16
Message-ID: 033101d73b90$07499070$15dcb150$ () org
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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.org@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

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