Informational

1) Create directory in /usr/share/squirrelmail/ for example attach - /usr/share/squirrelmail/attach
2) chmod 733 -R /usr/share/squirrelmail/attach
2) squirrelmail-configure
3) Choose 4(General Options) and press Enter
4) Choose 2(Attachment Directory) and past /usr/share/squirrelmail/attach