yes, right click on user profile icon and click reset option

I have reset the password and got a message.

"Password reset, user notified"

But the user is not receiving any mail.

Where can I find the elgg mail settings. ?

We have a wiki with documentation: http://docs.elgg.org/

The short answer is that it is a server configuration issue, not an Elgg issue.

Are you on local host or on production?

I hve a production and a test.

Mail is not working in both machines. Plz find the test server mail log when I reset the password of a user.

Jul  7 10:36:37 gtlforum postfix/pickup[19727]: 198B21BFAE5: uid=48 from=<apache>
Jul  7 10:36:37 gtlforum postfix/cleanup[22092]: 198B21BFAE5: message-id=<20120707093637.198B21BFAE5@gtlforum.com>
Jul  7 10:36:37 gtlforum postfix/qmgr[1453]: 198B21BFAE5: from=<apache@gtlforum.com>, size=504, nrcpt=1 (queue active)
Jul  7 10:36:37 gtlforum postfix/smtp[22094]: 198B21BFAE5: to=<anoopw13@yahoo.com>, relay=none, delay=0.52, delays=0.34/0.05/0.12/0, dsn=5.4.4, status=bounced (Host or domain name not found. Name service error for name=geojit.com type=AAAA: Host found but no data record of requested type)
Jul  7 10:36:37 gtlforum postfix/cleanup[22092]: 87A261BFAF2: message-id=<20120707093637.87A261BFAF2@gtlforum.com>
Jul  7 10:36:37 gtlforum postfix/qmgr[1453]: 87A261BFAF2: from=<>, size=2495, nrcpt=1 (queue active)
Jul  7 10:36:37 gtlforum postfix/bounce[22096]: 198B21BFAE5: sender non-delivery notification: 87A261BFAF2
Jul  7 10:36:37 gtlforum postfix/qmgr[1453]: 198B21BFAE5: removed
Jul  7 10:36:37 gtlforum postfix/local[22097]: 87A261BFAF2: to=<root@gtlforum.com>, orig_to=<apache@gtlforum.com>, relay=local, delay=0.22, delays=0.07/0.04/0/0.1, dsn=2.0.0, status=sent (delivered to mailbox)
Jul  7 10:36:37 gtlforum postfix/qmgr[1453]: 87A261BFAF2: removed

Do I ned to install my own mail server for elgg ??

If I can use yahoo or gmail, how can I ?

You need to fix your server. This is not an Elgg issue. Talk to the tech support for your server.

Just google for php mail() function and see whether mail() function is working in your server.

@Anoop follow the steps to check mail function

• Create a file test.php
• put code below in it and save

• Now upload this file to your website and call it example : yourwebsite.com/test.php
• if function is available you recieved this message:php mail() is available.
• if function is disabled you recieved this message php mail() is disabled.

 And if function is disabled you need to contact your hostprovider or change you hosting service.