mail sending problem

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http://www.linuxquestions.org – I am having a small problem. I have a computer in a domain on which some applications need to send email to the outside users.The SMTP server is not in my control.It is managed by some other persons. In my application I need to enter IP of SMTP,Port,My username and password. After this the documentation says it will work i.e. the application should be able to send emails. I did as the documentation says but sending of test emails from the application failed. There is an option in the application to test the SMTP settings and it said that SMTP mail sending fa (HowTos)