Re: [exim/exim] [Bug]: A userforward which saves to a file and then delivers fails to set uid under heavy load (Issue #3235)

Assuming the issue arises during direct processing, not following queueing:

Simplest will be to add -d+all+pid to the command-lines injecting the test mails, and gathering stderr. to file. Use a separate file per injection (eg. using a loop counter), please.

Grep the files for unable to set , pick one and attach here.
If it doesn't show (but logs do) then we'll have to set debug on the queue-runner (probably the main daemon). But try the above first.

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View it on Exim Forgejo ( https://code.exim.org/exim/exim/issues/3235#issuecomment-239961 ) or reply to this email directly.