Re: Mail error: reason: 550 5.0.0 You must use a valid mail server

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On Fri, Nov 14, 2003 at 07:32:46AM -0500, Kevin MacNeil wrote:
> You can get around the reverse dns problem with a dyndns.org (or
> similar) dynamically assigned hostname. 

Nope - that only handles forward lookups.

> Keep in mind that lookups on your ip will resolve to the hostname
> assigned by your ISP. However the mail will still get through, provided
> that your ISP isn't blocking outbound smtp traffic. 

You'll just get mail rejected because you're on a dynamic IP address
using one of the many blackhole lists that included these.  There is
absolutely nothing you can do to prevent yourself from being on one.
 
> If your ISP is uncooperative, you can always use their mailserver as a
> smarthost.

It's not really your ISP's issue.  The anti-spam sites collect the range
of subnets that are dynamically assigned and then add them to the
blackhole lists.  It's the receiver's MTA that will reject your e-mail
if it sees the mail coming from your dynamic address.

The solution is to use your ISP as a smart host.

-- 
Ed Wilts, Mounds View, MN, USA
mailto:ewilts@xxxxxxxxxx
Member #1, Red Hat Community Ambassador Program


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