I got stuck here on page 3: Where is the scripts/vacation.pl located for me to copy it to /var/spool/vacation/vacation.pl ?
Thank you Falko. It returned /var/www/groupoffice/modules/postfixadmin/scripts/vacation.pl BTW, vague information is overflowing from that tutorial. If you have the time, I would love to hear your take on it. I think its probably only meant for advanced users, because I wasn't able to follow it. For example on page 4 & 5 it asks you to edit files, and it gives you the code to insert into them. Well, I did that but the files it told me to edit were new, blank files! So, I have no idea, if postfix is gonna work right. I ordered a book from the library to help with this.
It probably has something to do with the files I edited, but I got this error, when trying to setup an email for the first time in Groupoffice: Could not connect to localhost at port 143 The mail server returned: Can not authenticate to IMAP server: Authentication failed.