[SM-USERS] Cant send Mail via SquirrelMail

[Logan Wolverine]

i have recently set squirrelmail with smtp , pop and imap
i use redhat Enterprise Linux ES
i cant send mail via squirrelmail web interface but i can mail via Outlook
it seems that the mail was sent but the mail isnt there
i read from the FAQ that its problem with php.ini i checked it out and found that php.ini had the
file_upload = on set

can anyone help me regarding the matter