Package: procmail Version: 3.22-20+deb7 sendmail on debian runs as user 'smmta'.
Please add this user to this user to the TRUSTED_IDS list in config.h: #define TRUSTED_IDS {"root","daemon","uucp","mail","x400","network",\ "list","slist","lists","news", "smmta", 0} Without this user in the TRUSTED_IDS list, when sendmail, running as smmta, passes the message to procmail, an extra From line gets added to messages which looks like this: >From smmta Sat Jan 10 18: 18:42 2015 For reference, this was discussed on the sendmail group back in 1999: https://groups.google.com/forum/#!searchin/comp.mail.sendmail/unix$20from$20line/comp.mail.sendmail/YzCbxAwWQuM/QPaW9D76YjkJ