On Wed, 23 Jul 2003 22:15:30 EDT, "Stan V. Smith" <[log in to unmask]> wrote:

>We average about 10 msgs a day on our list and are getting the following
>error about once a day and cannot figure out why.  the email address is valid. Any
>ideas?

>  1 07/19 07/19 John Gayer <[log in to unmask]>
>                Last error: 5.1.1 Mailer [64.49.220.152] said: "550 5.7.1
>                            Unable to relay for [log in to unmask]"
>

the mailer at WHATHELPS.COM uses the Imail program.  This is either a
configuration bug or something misbehaving in that program and (temporarily)
refusing to accept mail for that particular address.  Your only recourse is to
document the instances and report it to whathelps.com.  They will need to be
the ones to fix it.