How to change default email address for postfix?

postfix-mta

I have a server running python, php, perl, ruby, and I have couple applications which also send mail. I was wondering in case if one of the applications don't specify a from email address, the sender email address is set to http@example.com and the sender name was "http".

I was able change the sender name by going into /etc/passwd and changing the name to what I wanted, but how do I change http@example.com to admin@example.com?

Best Solution

You can use the smtp_generic_maps of postfix to rewrite email headers for outgoing smtp mail:

user:~$ echo "http@example.com  admin@example.com" >> /etc/postfix/generic 
user:~$ echo "smtp_generic_maps = hash:/etc/postfix/generic" >> /etc/postfix/main.cf
user:~$ postmap /etc/postfix/generic
user:~$ service postfix restart
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