Iphone email issues DNS?

Hi Experts, I think I have a DNS issue but im not sure how to fix it.
We have just replaced the ISP at a clients site and have installed a new netgear dg834g router and since the change their 2 iphones that have stopped working. We have a mail. record and remote. record pointing to their server on 87.x.x.x - everything is working fine bar the iphones. Any suggestions?

Cheers Simon  
leehewsonAsked:
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Alan HardistyCo-OwnerCommented:
Have you allowed TCP port 443 through and forwarded it to your Exchange Server?  That is all that is required for Activesync to work.
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leehewsonAuthor Commented:
Hi, 443 is allowed through. The problem is that when the iphones connect to the 'mail.' address via the wireless connection they are unable to send/receive emails.

Weird

Cheers Simon
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Alan HardistyCo-OwnerCommented:
Visit https://testexchangeconnectivity.com and run the Exchange Activesync Test.
Specify manual server settings and if you use a self-signed certificate, check the Ignore Trust for SSL check box.
What results do you get?
If you have changed ISP's - the iPhone artime provider has to catch up on DNS changes and this can take 24-48 hours, so not unusual.
You can change the email account to use the new IP address instead for the time being and then change it back once DNS has replicated changes properly.
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leehewsonAuthor Commented:
Cheers for that. The activesync test worked fine so it could be DNS changes. Ill try tomorrow and let you know.

Cheers Simon
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Alan HardistyCo-OwnerCommented:
You can adjust the iPhone settings and change mail.yourdomain.com to the IP address if you don't want to wait.
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