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[Ruud Baart <address@concealed>]

If i follow your strace statement, the mail is stored in the postfix active spool directory 

-Queue ID-  --Size-- ----Arrival Time---- -Sender/Recipient-------
3DEF95F444E*    2688 Wed Feb  4 21:32:05  address@concealed
                                         address@concealed

It is stored as expected in /var/spool/postfix/active/3DEF95F444E

in de logging:

Feb 04 20:14:20 monk postfix/pipe[17727]: 00C185F444E: to=<address@concealed>, relay=sympa, delay=1695,  delays=694/0.01/ 0/1000, dsn=5.3.0, status=bounced (Command time limit exceeded: "/usr/bin/strace")
Feb 04 21:32:05 monk kernel: audit: type=1326 audit(1770237125.277:124): auid=4294967295 uid=120 gid=126 ses=4294967295 subj=unconfined pid=26499 comm="strace" exe="/usr/bin/strace" sig=31 arch=c000003e syscall=101 compat=0 ip=0x7f9eef626888 code=0x80000000

Op 4-2-2026 om 19:01 schreef Jean Charles Delépine:

    Quoting
      Ruud Baart <address@concealed>:
      
      
> In postfix master.cf
>         
>         
>         sympa   unix    -       n       n       -       -       pipe
>         
>           flags=hqRu null_sender= user=sympa
>         argv=/usr/local/sympa/bin/queue ${nexthop}
>         
>       
      
      Change that by :
      
      sympa   unix    -       n       n       -       -       pipe
      
         flags=hqRu null_sender= user=sympa argv=strace -o
      /var/tmp/queue /usr/local/sympa/bin/queue ${nexthop}
      
      
      And send a mail.
      
      
      You should find something like :
      
      [...]
      
      chdir("/var/spool/sympa/queue")         = 0
      
      umask(027)                              = 077
      
      getpid()                                = 445618
      
      openat(AT_FDCWD, "address@concealed",
      O_WRONLY|O_CREAT, 0600) = 3
      
      [...]
      
      
      Maybe that can clarify things.