Am 06.01.24 um 22:41 schrieb Steffen Nurpmeso:
Hello Peter, welcome.

Peter Bieringer wrote in
  <baf25f3c-70fb-45fb-a38f-7dcf91008...@bieringer.de>:
  |during migration and testing an e-mail system coming from Enterprise
  |Linux 8 to 9 it turned out that EL9 has no longer "mailx" but "s-nail"
  |packaged.
  |
  |And the behavior regarding verp delimiter "+" support is different,
  |"s-nail" is missing it.

It is not valid alias content.

Thank you for your hints, found at least a workaround:

echo "Test" | mail -s "Test" account+sub@$HOSTNAME


Interesting that you try to test a verp delimiter address.

It is a special construct for sharing one local mailbox user and having special "sub" handling via maildrop's mailfilter like (excerpt):

import LOCAL
import RECIPIENT
import SENDER
import EXTENSION

log "INFO: LOCAL=$LOCAL RECIPIENT=$RECIPIENT SENDER=$SENDER

FINALSENDER="postmaster@domain.example"

if ( $EXTENSION eq "test" )
{
        FINALRECEPIENT="user@otherdomain.example"
}

if ( $FINALRECEPIENT ne "" )
{
        log "ACT : forward FROM=$FINALSENDER TO=$FINALRECEPIENT"
        xfilter "reformail"
        /^.*/
        to "| $SENDMAIL -f $FINALSENDER $FINALRECEPIENT"
}


Regards,
        Peter

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