Unable to send Emails using Mobile Data with exchange server

[Anonymous]

Hi,

Several users in my company have intermittent issues sending emails over mobile data with our exchange server. 

It works over WiFi everytime, and other email accounts such a btinternet account work absolutley fine. 

I have tried using phones on a different network using mobile data and it works without issues so the issue seems to point to an issue with the O2 network. 

Any suggestions here would be welcomed. 

[MI5]

Are you using your own smtp server or o2's (smtp.o2.co.uk) ?

[Anonymous]

It can be related to the security settings. You need to allow emails without Wifi.

[Anonymous]

It is our own SMTP server, there is no option to use a different SMTP server with an exchange account on iPhones.

Although excuse my ignorance, could this be different when sending over WiFi compared with using 3G/4G etc.

[MI5]

Yes, quite often wifi will work when mobile data won't.
I'm not sure how you would work around the smtp server on an iPhone, but I suspect that's the problem.

[Anonymous]

UPDATE: 

After a bit more investigation this actually only seems to be an issue iPhone 6. - All other phones works fine. 

Has anyone come across this?

[Anonymous · Accepted solution]

Just an update on this. Upgrading to the latest exchange service pack (Exchange 2010 SP3) seems to have resolved my problem. 

[MI5]

Good to know.

[grittkim49]

I have not unstood any of the comments from anybody?

[Cleoriff]

@grittkim49  What problem are you having exactly and what phone are you using? If you explain more we may be able to advise?