Do not use multiple devices for BT email

I have been advised by the Yahoo email support team that my account is being locked every few hours because I use multiple devices and the server sees multiple requests to 'sync' email from one account onto several devices as malicious activity.  I use outlook on three PCs (a desktop and a couple of laptops) and the default email client on a stock Android.
The advice I've been asked to follow is to ensure I close outlook (on which I view several email accounts) every time I walk away from my desk and then enable email sync on my phone.  On return to my desk I should reverse the process. I'll do this in the short term as it will take a few days to switch from BT email to another provider but this is not sustainable. 
I find it hard to believe that the btinternet system isn't robust enough to accept single user/multiple device scenarios.  The problem has only manifested this week so I suspect it will be due to a change in system protocol/software as I have had a few years of trouble free multiple device access until this point. 
I'm interested in other peoples' experience of this as it's the only email service I use which has exhibited this issue in recent years.
Solved!
Go to Solution.

vofsanity2 wrote:
I copy below my post on another thread.
There are several reasons why you get password rejected messages however based on the information you have supplied I have the following observations and advice.
1.  The failure message incorrect in that your username and password is likely to be correct but is being rejected for another reason.
2.  The most likely cause is some form of timeout.
3.  Providing you have a reasonably fast connection the timeout is likely to be because your account is being accessed by two or more of your devices at the same time.
4. To stop this happening you need to do the following.
a)  Do not use webmail unless you have to.
b)  If you do use webmail make sure that you sign out when finished.
c)  Make sure that all your devices do not check for emails automatically but require manual intervention.
Not sure this is strictly necessary, unlikely devices will be polling simultaneously.
d)  Use POP instead of IMAP in email clients.
e)  Make sure smartphones and  tablets have Email accounts Push "off "and Fetch data "manually".
Not sure this is strictly necessary, unlikely devices will be polling simultaneously. Agree with Push 'off'

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