12-11-2012
I think it would make sense to change your mail server than your code. Otherwise it's not really been tested.
"intercepting" a command is going to be very awkward at best.
I suppose you could have a MAILX variable, and use $MAILX instead of mailx for your mail command, and alter the variable when your program begins depending on the hostname.
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from(1) General Commands Manual from(1)
NAME
from - Shows whom mail messages are from
SYNOPSIS
from [-s sender] [user]
The from command prints out the mail header lines in your mailbox file.
OPTIONS
Prints headers for mail sent by sender. Specifies a mail spool directory.
Use this flag if you want to examine a mailbox in a directory other than /usr/spool/mail, which is the system default.
DESCRIPTION
If user is specified, then user's mailbox is examined instead of your own.
EXAMPLES
To display the message headings in your mailbox, enter: from
The names of the senders and the message dates are displayed. To display the message headings for mail sent by a specific user,
enter: from -s dale
Displays only the message headings of the messages sent from user dale. To display the message headings in a specific user's mail-
box, enter: from dawn
The message headings from user dawn's mailbox are displayed, provided you have read permission for dawn's mailbox.
FILES
User mailbox files.
SEE ALSO
Commands: biff(1), mail(1), mailx(1)
from(1)