John Brahy:
> Should I be worried when I see: root+:|sleep 5 as the username?
>
> ---------- Forwarded message ----------
> From: Mail Delivery System <[email protected]>
> Date: Wed, Dec 22, 2010 at 02:33
> Subject: Postfix SMTP server: errors from sc4-scan54.someserver.com[x.x.x.x]
> To: Postmaster <[email protected]>
>
>
> Transcript of session follows.
>
> ?Out: 220 someserver.com ESMTP Postfix
> ?In: ?HELO calistolabs.com
> ?Out: 250 someserver.com
> ?In: ?MAIL FROM: <r...@[x.x.x.x]>
> ?Out: 250 2.1.0 Ok
> ?In: ?RCPT TO: root+:"|sleep 5 #"
> ?Out: 550 5.1.1 <root+:|sleep 5 #>: Recipient address rejected: User unknown
> in
> ? ? local recipient table
>
> Session aborted, reason: lost connection
>
> For other details, see the local mail logfile
That depends on what NON-POSTFIX programs will handle the mail.
POSTFIX does not care if the address has shell operators.
Wietse
