Sendmail masquerading configuration

Ted Mittelstaedt tedm at
Tue Feb 8 22:51:18 PST 2005

> -----Original Message-----
> From: owner-freebsd-questions at
> [mailto:owner-freebsd-questions at]On Behalf Of Ruben de Groot
> Sent: Tuesday, February 08, 2005 4:47 AM
> To: Ted Mittelstaedt
> Cc: Ian Moore; freebsd-questions at
> Subject: Re: Sendmail masquerading configuration
> >
> > X-Authentication-Warning: root set sender to
> > someuser using -f
> Sorry, but this simply isn't true. I have just tested this. Warnings
> like this might get generated when you remove root from the
> TRUSTED_USERS macro; *NOT* when you remove it from EXPOSED_USERS.

Your right, me bad!

> > It also makes it harder to troubleshoot when someone external to
> > your system is sending bogus junk to you.
> I agree. As I said in the part of my message you snipped:
> "BTW, I agree that masquerading is NOT the proper way to do
> these things."
> > And while it's not applicable now, with older versions of sendmail
> > this would definitely break all your scripts that used e-mail.
> >
> > Use of the -f flag is what he needs to do.
> Fine. But the OP's problem concerned mail send by cron. How would you
> instruct cron to use the -f flag? (There's a MAILTO environment
> variable in cron, but no MAILFROM)

I would probably install src/usr.sbin/ and recompile cron to use
the -f flag.  The flags are settible in cron/config.h in the source,
FreeBSD uses

#define MAILARGS "%s -FCronDaemon -odi -oem -oi -t"             /*-*/

just change this to

#define MAILARGS "%s -FCronDaemon -froot at -odi -oem -oi -t"


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