Wrong 'From' address while sending emails

I have setup ISPConfig 2.2.32 on CentOS 4.3.
The hostname of the machine is www.progresspartners.co.in
While sending the mails using Squirrelmail the From address is shown as:

instead of

I am using postfix 2.3.3 and squirrelmail 1.4.8.
From what I read, the two important configuration variables which not set properly could cause this
1) virtual_maps:

Code:

$ grep virtual_maps /etc/postfix/main.cf
virtual_maps = hash:/etc/postfix/virtusertable

Code:

$ ls -al /etc/postfix/virtusertable*
-rw-r--r-- 1 root root  1023 May 13 02:05 /etc/postfix/virtusertable
-rw-r--r-- 1 root root   877 May 13 02:05 /etc/postfix/virtusertable~
-rw-r--r-- 1 root root 12288 May 13 02:05 /etc/postfix/virtusertable.db

2) mydestination

Code:

$ grep mydestination /etc/postfix/main.cf
mydestination = /etc/postfix/local-host-names

Code:

$ ls -al /etc/postfix/local-host-names
-rw-r--r-- 1 root root 443 May 13 02:05 /etc/postfix/local-host-names

Thus, both the settings are correct and the files exist.

Code:

 lsof -i :25
COMMAND   PID USER   FD   TYPE  DEVICE SIZE NODE NAME
master  11742 root   11u  IPv4 9376108       TCP *:smtp (LISTEN)

Also, postfix is running as root, so it can read the required files.
What can be the problem? Why are mails not being sent which proper domain name and username?

 

Because every user of SquirrelMail has to manually add:

E-mail Address:

and

Reply To:

in Options - Personal Information

and if not default domain is used.

Don't know how to change this behavior so this can be automatically changed to adequate domain under which user is created.

 

Thank You x. Yes, I see that behaviour. But, if there's a way I can avoid that, it would be great.
Let me also test using some IMAP client and check the behaviour today.