iPhone deleting messages from POP server even though it is set to NEVER do this

Hello - I have set my iPhone to grab messages from my POP gmail account to leave them there so that I can then also grab them from my laptop (which then deletes them). To do this I chose the NEVER DELETE FROM SERVER option in the Advanced account settings on my iPhone. However, it appears that messages are being deleted when I use my iPhone to collect them. Has anyone experienced the same thing with this iPhone / gmail combination? PS - I have other accounts with other providers on the same phone and they are behaving as expected.
TedMoreyAsked:
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Thomas Zucker-ScharffSolution GuideCommented:
Which iPhone / iOS version? Are you using Gmail or inbox?
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Michael-BestCommented:
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David Johnson, CD, MVPOwnerCommented:
the deletion is done by the server not the client. use imap instead of pop3 for both your phone and your desktop.
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JohnBusiness Consultant (Owner)Commented:
I use IMAP for iPhone and POP3 for Outlook. POP3 is set on all computer. I do not see a setting in the iPhone. It collects mail and does not delete after connection. If I delete on the iPhone, the mail is gone.

I do not see any such setting as you do in my iPhone (IOS 9.0.2). Are you sure you are using IMAP on the iPhone? It sounds like a POP setting.
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Mal OsborneAlpha GeekCommented:
I have seen this before. Some ISPs just delete POP3 mail once it has been accessed. If you set up a PC with Outlook, you can enable logging and see the entire transaction happen.

Alternatively, POP3 is pretty simple. You can just telnet to port 110 on the server, manually read some emails and see if they get deleted by the ISP

These links should be enough to get you talking POP3:
http://www.electrictoolbox.com/article/networking/pop3-commands/
http://kewl.lu/articles/pop3/
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TedMoreyAuthor Commented:
Hello everyone - I have made a conscious decision to use POP rather than IMAP, so don't plan to change the config. I am fully up to date with iOS updates (so 9.0.2) however this problem occurred with iOS 8 as well - in fact ever since I got my iPhone 5s. The email account is a gmail mailbox. As I mentioned previously I have a number of other accounts on the same phone, all setup to use POP and leave the messages on the server - the only one that is misbehaving is gmail - the others (not gmail) work fine. Any suggestions how I can go about diagnosing what's going wrong?
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JohnBusiness Consultant (Owner)Commented:
If you are using POP on the iPhone, and have it set to Leave Messages on the Server, AND If it is not doing that, you need to report this to your email ISP Support and see if they can help. The ISP Email Web Page is "IMAP" in nature and if it is working properly, then it is interacting improperly with the iPhone.

Maybe use IMAP on the iPhone and POP3 on the computers. I do this and it works fine.
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Mal OsborneAlpha GeekCommented:
You need to see the POP transaction happening somehow.  Deletion of email via POP3 is done by the DELE command. Either it is there, in which case your phone is initiating the deletion or it is not, in which case the server is doing it.

Any way you can set up a PC with Wireshark and sniff packets on port 110?
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TedMoreyAuthor Commented:
Hello again everyone.

Thanks for replying.

John's comment about using IMAP on my phone + POP on my computer is genius, I'll try that + report back.

Cheers
Ed
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Michael-BestCommented:
Update to iOS 9 release September 16, 2015
http://www.apple.com/ios/whats-new/

If you still have problems post again after the update.
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TedMoreyAuthor Commented:
Hello again - still no luck, even after the iOS update. I'm headed to the Apple forums + will report back.
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TedMoreyAuthor Commented:
Hello again again - I have had another thought. When I look at my Gmail POP account via a browser, messages that my iPhone has downloaded are indeed still there - they are not being deleted, so the iPhone is behaving itself. However when my laptop checks the Gmail POP account it is not recognising that there are messages that it has not previously downloaded. My laptop is a Windows machine and I'm using Outlook 2013. The odd thing is that my other email POP accounts are behaving as I would have expected. I wonder if there is a special setting in either Outlook or my Gmail account I need to configure?
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TedMoreyAuthor Commented:
Wow - here's the answer, contained in Gmail's help...

https://support.google.com/mail/answer/47948?vid=null

By adding 'recent:' to the front of the POP username on my laptop it is now looking for new messages even if they have already been downloaded by my iPhone.

Thanks for everyone's input - your ideas have provided the necessary inspiration!
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