Sir 
    I have installed Red Hat LINUX-5 on my server gau.guj.nic.in, IP 164.100.98.126. The sendmail is not working. I can send mail properly from server but from nodes(with IE4) I can't, it gives error WE DO NOT REALY SECURE PORT 25, ERROR 551. I can aslo send mail properly from nodes using telnet. What is solution for this. My server is also not receiving the mail at all.
 
Regard
 
A linux lover from India
 
Dr. Sarvaiya

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