linux mail

I have a linux server thru which I am sending and receiving mails?Since I had problem with the booting i have to re-install the linux, after that I am not able to send mail but i am receiving.

can u help me?
what configuration that has to be changed?
johnwinnyAsked:
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philiph_elvisConnect With a Mentor Commented:
Assuming you are running sendmail (the default mail transfer agent), you need a valid /etc/sendmail.cf  config file.  You can edit this file by hand (not recommended), or use some other higher-level tool (like linuxconf).

Also, as the first comment indicated, dns has to be set up correctly too.
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willie55Commented:
Check your DNS settings and make sure that they are correct.
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