Read receipt requested on all sent emails has produced a persistent duplicated confirmation every 30 seconds and seems to be in an endless loop. Workgroup includes MD and his PA. The PA gets every email sent to the MD. Both persist against best advice in using "read receipt" for all mail. Outlook 2003 on XP Pro machines. Somehow an email read by one of them has generated a read receipt confirmation which spawns a new confirmation every 30 seconds into the MD's inbox. This has been going on, apparently, for a few days. Both machines test virus free and both have been re-booted. I am going to visit the site but if anyone has any bright ideas to check please say!