I'd guess sudo is configured to send mail in some situations. And that the parameters to the program are not what postfix expects.

Farid Hamjavar wrote:

Centos 5

Hello

I successfully converted my mta from sendmail to postfix. no problem. mail is ok.

A by-product of that, as bizarre as it may seem is this:

As regular user, when I do 'su -' to become root, all is well.

As regular user, when I do 'sudo bash' I become root alright but I also get:

sendmail: fatal: Recipient addresses must be specified on the command line or via the -t option

I tried many things ranging from temporarily swapping sendmail.postfix to messing around with /etc/profile and /etc/skel/* and many other things.

How can I address the annoying message above?

Thanks, Farid

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