<div>
all IP if your spam server to relay in send connector (Exchange 2007), smtp settings in exhcnage 2003
</div>


all IP if your spam server to relay in send connector (Exchange 2007), smtp settings in exhcnage 2003

<div>
Thanks alanhardisty - that was it.
</div>


<div>
<div class="content wysiwyg-content">
I have an offsite spam filtering solution that all of our mail is routed to first and then forwards mail to our Exchange Server that sites behind a Sonicwall. Incoming mail is rejected with a &quot;recv: 550 5.7.1 Unable to relay for . . .&quot; error.
</div>
</div>


I have an offsite spam filtering solution that all of our mail is routed to first and then forwards mail to our Exchange Server that sites behind a Sonicwall. Incoming mail is rejected with a "recv: 550 5.7.1 Unable to relay for . . ." error.

Need help setting up email forwarding from spam host to Exchange behind a Sonicwall

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.

Exchange

Various techniques are used to prevent email spam (unsolicited bulk email). No technique is a complete solution to the spam problem, and each has trade-offs between incorrectly rejecting legitimate email (false positives) vs. not rejecting all spam (false negatives) - and the associated costs in time and effort. Anti-spam techniques can be broken into four broad categories: those that require actions by individuals, those that can be automated by email administrators, those that can be automated by email senders and those employed by researchers and law enforcement officials.

AntiSpam

Hardware-based firewalls provide more sophisticated protection for inbound and outbound traffic than the simple Windows software firewall or the basic NAT firewalls found in routers. These devices implement techniques such as stateful packet inspection, deep packet inspection, and content filtering; and may include built-in antivirus and anti-malware protection.