carlopmart wrote: > Ralph Angenendt wrote: >> Looks like the client wants to have a delivery notfication and postfix >> answers it. This seems to be a client configuration "problem" if it only >> happens with one client. > No, this problems occurs on several clients ... And not all are windows > clients: my clients are linux, windows and mac. This happens when the clients want a "delivery report" - please see the mail client configuration. Ralph -------------- next part -------------- A non-text attachment was scrubbed... Name: not available Type: application/pgp-signature Size: 189 bytes Desc: not available URL: <http://lists.centos.org/pipermail/centos/attachments/20080521/cc216bcc/attachment-0005.sig>