After a quick investigation, postalias
seemed to have done the trick instead of postmap
[root@nemesis ~]# postalias /etc/aliases
[root@nemesis ~]# l /etc/aliases*
-rw-r--r-- 1 root root 1.6K Oct 28 17:04 /etc/aliases
-rw-r----- 1 root smmsp 12K Oct 28 17:13 /etc/aliases.db
Oct 28 17:14:43 nemesis postfix/local: E6FD24405A1: to=<email@example.com>, orig_to=<firstname.lastname@example.org>, relay=local, delay=16, status=sent (delivered to command: /usr/bin/procmail -f-)
Success! Further investigation to follow. Thank you very much for your help till!
P.S. For the records, here is the difference between postmap and postalias (taken from the man pages):
INPUT FILE FORMAT
The format of a lookup table input file is as follows:
· A table entry has the form
key whitespace value
The postalias(1) command creates or queries one or more Postfix alias databases, or updates an existing one. The input and output file formats are
expected to be compatible with Sendmail version 8, and are expected to be suitable for the use as NIS alias maps.
Thanks once more!
Edit: 'newaliases' also ran with no errors - I hope it is the same as the postalias I mentioned above.