Question? Moving over to new ISP...outgoing/incoming email problem.

Our company is moving over to a new ISP in a week and would like to gather as much info as possible so the transition happens seamlessly without a big impact.

Current service:
ISP: a company i shall not name
MPLS network
ISP host our DNS, MX, A records
ISP host our website NS

New service:
MPLS Network
ISP will be hosting our DNS, MX, A records
ISP will be hosting our website as well

I think I already know the answer to this, but last week I did a dry test run on the new Internet provided by the new isp. Made changes to the firewall and internet traffic was coming through successfully. Edit the NAT on our exchange server to reflect the new wan ip. Went to the new ISP DNS portal and added a new MX and A records pointing to the new IP. Problem that i ran into was that I wasn't able to send or receive outside emails. Was that because our domain name is still hosted at the old ISP?
Who is Participating?
Manpreet SIngh KhatraConnect With a Mentor Solutions Architect, Project LeadCommented:
Problem that i ran into was that I wasn't able to send or receive outside emails - Yes and if you have some updates to the Internet IP or records it can take somewhere between 24-72 hours for full replication and have updtes on all Internet DNS server.

Once you did a dry test you could have tested with (Inbound and Outbound email flow) (for your recodrs)

- Rancy
MikeIT ManagerCommented:
You need to set your domain to point to the new DNS servers.
ZerodotZerodotZerodotZeroAuthor Commented:
So everything seems correct except for not updating the NS for the domain, which cause the email issue that I encountered during the dry test?

Rancy - Thanks, I will definitely use those tools.
Manpreet SIngh KhatraSolutions Architect, Project LeadCommented:
As i said even as some people make some Changes to their current MX records with the ISP it takes time to get updated with all Internet DNS server so need to wait .... thats what i can think of and have seen many a times :)

- Rancy
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