can not send email from your linux box ?

1. Check /var/log/mail.log and see what the error
2. If you see this “postdrop: warning: unable to look up public/pickup: No such file or directory”
Do this :
# /etc/init.d/sendmail stop

# mkfifo /var/spool/postfix/public/pickup

# /etc/init.d/postfix restart

3. If you get 550 verification error

edit file /etc/postfix/

Change the servername to full dns name for ex: servermail to
verify from public internet

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