<div>
Thanks have dealt with these. but always great to be sure, including lowering the TTL's <br />
<br />
But will check that SPF's have removed old sending IP instances. <br />
<br />
AJ
</div>


<div>
<div class="content wysiwyg-content">
Hi all, <br />
<br />
I am about to cut over from one ISP to another. we have rebuilt our exchange servers and have the whole internal mail flow working without issue. the edge solution is working with the current ISP. we are about to cut over to the new ISP service (IP is different) and have done much testing. (we initially had issues with being blocked by external spam and block lists. some emails would be delivered fine, other domains unable to receive from us. same with some incoming. <br />
<br />
we have done as much test prep but I would like to know of any thing else we might have failed to check for before doing such a cut over so I can implement in my change control process in the transitional testing phase before the migration. <br />
<br />
Hard one to allocate points to. So will split or give to best fitting responses. <br />
<br />
thanks &nbsp;<br />
<br />
AJ
</div>
</div>


Hi all, 

I am about to cut over from one ISP to another. we have rebuilt our exchange servers and have the whole internal mail flow working without issue. the edge solution is working with the current ISP. we are about to cut over to the new ISP service (IP is different) and have done much testing. (we initially had issues with being blocked by external spam and block lists. some emails would be delivered fine, other domains unable to receive from us. same with some incoming. 

we have done as much test prep but I would like to know of any thing else we might have failed to check for before doing such a cut over so I can implement in my change control process in the transitional testing phase before the migration. 

Hard one to allocate points to. So will split or give to best fitting responses. 

thanks  

AJ

Thanks have dealt with these. but always great to be sure, including lowering the TTL&#39;s 

But will check that SPF&#39;s have removed old sending IP instances. 

AJ

Outbound /inbound Mail Cut over risks

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

Within Internet message handling services (MHS), a message transfer agent or mail transfer agent (MTA) or mail relay is software that transfers electronic mail messages from one computer to another using a client–server application architecture. A MTA implements both the client (sending) and server (receiving) portions of the Simple Mail Transfer Protocol (SMTP). The terms mail server, mail exchanger, and MX host may also refer to a computer performing the MTA function. The Domain Name System (DNS) associates a mail server to a domain with mail exchanger (MX) resource records containing the domain name of a host providing MTA services.

Email Servers

Microsoft Forefront, formerly known as Internet Security and Acceleration Server (ISA Server), is a network router, firewall, antivirus program, VPN server and web cache that runs on Windows servers. It includes identity management and protection systems, and discontinued systems for threat management and network protection, along with protection for Sharepoint and Exchange. The scope of discussions includes forward and reverse proxy, application and service publishing, virtual private networks (VPNs), outbound access rules, SSL certificates and network routing within either a single node or an highly-available array pairing.