Intermittent: mail does not download

Hi,
I manage around 20 iPhones for our firm, which are a mix of iPhone 6, 5S and 5C. We have an in-house Exchange 2010 server running the latest updates.
Our heaviest email user receives around 300 emails per day and is often out the office. He currently uses an iPhone 6 (running iOS 8.1). He previously had an iPhone 5C running various versions of iOS 7 and 8.
Across both device and different iOS versions he regularly has issues where he would check his email, the spinning wheel would show up and the message "connecting..." would appear at the bottom of the mail app but no emails would come in. This could last around 1 hour. During this time he can be either on 3G, 4G or wifi and sometimes moving between these connection types. Eventually, he would turn off his phone, turn it back on again and a flood of unread emails would flow in.
Typically the pattern is he is returning to the office from being on 3G or 4G and when connecting to wifi the emails would flood in. However, this is not always the case. For example, he just returned to the office, we watched his phone connect to our internal wifi and we waited. After a few minutes, we pulled down in the mail app to refresh it. Waited again but still nothing. So we switched it off and on again, then 10 new emails appeared instantly.
No other staff appear to have this problem (at least no one has reported it to me).
Our internal wifi resolves the same public DNS address for our Exchange server as outside (eg when on 3G/4G) so this is not a DNS issue. Besides, others would have the same problem.
Having the user force quit the app multiple times a day, or reboot, isn't really a solution. Is there anything else I should consider for troubleshooting?
Thanks.

Just to follow on to Yorkie66's post, I too see this on my iPhone 6 Plus and another user with an iPhone 6 both running iOS 8.1. Doesn't matter what the connection type is (WiFi, 3G or 4G) or where the phone is at the time (in office, at home or on a job site), email just doesn't come through. It's only when manually refreshing the mailbox or taking an action on another email does the entire backlog of emails come to the phone. We're running Exchange 2007 (still) and support a very mixed environment of iOS and Android devices along with OSX and Windows and so far it seems only a couple of the iPhones have seen this issue.

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Extract 1: this for account exhibiting the inability to receive emails after 9 March:
<string>[email protected]</string>
</array>
<key>FullUserName</key>
<string>Warwick at Sandcastle Consulting</string>
<key>Hostname</key>
<string>pop3.paradise.net.nz</string>
<key>IsFirstTimeSync</key>
<string>YES</string>
<key>JunkMailboxName</key>
<string>Junk</string>
<key>NotesMailboxName</key>
<string>Notes</string>
<key>PortNumber</key>
<integer>110</integer>
<key>SMTPIdentifier</key>
<string>smtp.paradise.net.nz</string>
<key>SentMessagesMailboxName</key>
<string>Sent Messages</string>
<key>ToDosMailboxName</key>
<string>Apple Mail To Do</string>
<key>TrashMailboxName</key>
<string>Deleted Messages</string>
<key>UserAllowsInsecureAuthentication</key>
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<true/>
<key>Hostname</key>
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<integer>31457280</integer>
<key>PortNumber</key>
<integer>25</integer>
<key>UserAllowsInsecureAuthentication</key>
<false/>
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Good Morning
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Bare with me please, I am making this post very thorough. The other threads I have read are frusterating because the problems people tend to post are not clear.
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^
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msgsend.java:140: cannot find symbol
symbol : variable Session
location: class msgsend
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msgsend.java:145: cannot find symbol
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location: class msgsend
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symbol : class MimeMessage
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msgsend.java:157: package Message does not exist
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msgsend.java:158: cannot find symbol
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location: class msgsend
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msgsend.java:167: cannot find symbol
symbol : class MimeBodyPart
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msgsend.java:169: cannot find symbol
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msgsend.java:195: cannot find symbol
symbol : class URLName
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msgsend.java:218: cannot find symbol
symbol : variable Folder
location: class msgsend
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msgsend.java:220: cannot find symbol
symbol : class Message
location: class msgsend
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^
msgsend.java:220: cannot find symbol
symbol : class Message
location: class msgsend
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27 errors
Here are the methods I have tried...
1. Make sure you have most current version of Java
2. Reinstall Java
3. Attempt to compile in an IDE (Attempted in Eclipse 3.2)
4. Set class path
Some sources suggest "CLASSPATH" some suggest "CLASS PATH" as the variable name. I have tried both.
Below is what the classpath looks like in bold.
Variable Name: CLASS PATH
Variable value: c:\download\javamail-1.4\mail.jar;C:\download\jaf-1.1\activation.jar;.
I have double checked all folder names and copy pasted all entries to eliminate typos. Javamail-1.4 and jaf-1.1 are both located in c:\download which is the same location Class Path points to.
Thank you very much for your input and effort. I can imagine how frusterating it is responding to 20million javamail posts :) (that may be a bit of an overstatement!)
Thank you again!
Irbi
Message was edited by:
irbi
Message was edited by:
irbi

Yes - I have read that part of the README and did exactly as it has said in a previous attempt. I should have mentioned that here I'm sorry :)
I moved the .jar files into the download folder and set the classpath exactly as the readme shows.
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Exception in thread "main" java.lang.NoClassDefFoundError: msgsend/java
C:\download\javamail-1.4\demo>
I have tried fixing this error as well via forums and FAQs but it seems to be the most generic error.
One suggestion was to clear your classpath. I tried this with a test hello world program which was giving the same error - "NoClassDefFoundError". By clearing the classpath I was able to get the hello world program to run without this error. But I can't just clear the classpath in this instance because it needs to point to mail.jar and activation.jar for the program to compile.
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