Lots of possibilities. The two most likely, however --
1. File format. You're probably uploading a file that looks like this:
email@asdfasdf.com^M
asdf2@asdfasdsadf.com^M
asdfas3@asdf.asddf.com^M
your windows file as a <CR><LF>, and it needs to be in unix format. if you have any proficiency in unix, you can get programs called d2u which will fix up the formatting problem.
2. Permissions. Do you know what perms need to be set for .forward? Are they set properly?
-rw-r--r-- 1 jstewart home 55 Feb 25 13:29 .forward
Does your ftp program do this?
SOLUTION
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Can you "ssh" into the box and modify the .forward file directly? If so, you could use vi to edit the file, hit "i" for insert, and just slam the email addresses in this way using cut copy and paste and not worry about the extra ^M , file permissions, etc.
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Jim Stewart
Equity Technology Group
Better Busniess Web Hosting
"Be Good, Do Good, and have a good day."
www.equitytechgroup.com