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Iphone cannot send emails at night after 7 or so

I've got a user with an I phone, We set up her corporate email account on the phone using IMAP. It seems to work fine except at night about 7 or so (she says) she cannot send or receive company email from the phone. She can still send and recipe emails through her gmail account on the phone.I don't know when during the night it starts working again but in the morning it works for her. I've got other users using droids and blackberries and they don;t have any problems. I can;t finsd the cause for this. I don't see how the backups could cause this and they don't start till 11PM. Are there any IPHONE reasons I don't know about?
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Axis52401
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Axis52401
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top_rungCommented:
I don't have an iPhone, but have tested various phone apps.  All have settings for business hours and such that can be configured.  I guess it is possible that she has inadvertently configured the mail app and it simply isn't checking/sending during specific times  (?)

Have you seen this behavior on any other iPhones in the environment.



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ajmehtaCommented:
If this is just for sending, and just from her home, it could be something random like the ISP is blocking the specific smtp port she's using during night hours (to prevent spam)... And gmail servers may work on a different port.
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Aaron TomoskyTechnology ConsultantCommented:
I bet Thats when she gets on her home wifi and her ISP blocks port 25. Use an alternate imap port.
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Axis52401Security AnalystAuthor Commented:
As for the port blocking, its a cell phone and goes through the towers not her home internet ISP and I have seen ISPs block that but not just for a few hours a night. I'll see if there mail app has any time settings.
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Aaron TomoskyTechnology ConsultantCommented:
We know it's a cell phone. With wifi. And a user that probably has wifi at home. And an ISP that may block port 25. We are playing the percentages here based on very little information.
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akahanCommented:
There are no time settings on the iPhone's email app, don't waste your time.  What seems likely to me is that she doesn't have her SMTP and POP servers set up correctly for her ISP...when connected via 3G (phone-type connection), email is sent through the phone company's SMTP server (cwmx.com, or whatever).  When she's connected via wifi, it attempts to send through the ISP's server, but this requires that it be configured correctly for the ISP, probably that authentication be turned on, etc..

Simple experiment:  Turn off wifi on the phone.  See if everything works round the clock.  If so, the problem is that the phone is connecting to her wireless when she gets home,  and is not configured correctly.
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Axis52401Security AnalystAuthor Commented:
I'll try checking if she is using her home wifi, if there are blocking that port that could be it. As for the Mail servers for her isp the mail settings are for our office Email server not an ISP hosted mail system. Her phone can still send emails via Gmail when she is at home.
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akahanCommented:
Would she be able to connect to your office email server from a laptop connected to her home wireless system?  In other words, does your office email server require some authentication when connected to from outside your network, which perhaps her phone is not performing?
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Axis52401Security AnalystAuthor Commented:
We have remote access setup via a terminal server. I'll see if she wants me to try and set up Outlook on her home PC to test that. I'm having her try turining off the wifi on her phone tonight to try that.
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PeerbolteCommented:
Check if you have set up "log on hours" in the user's profile in Active Directory?
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Axis52401Security AnalystAuthor Commented:
No we don't restrict login hours
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