During the past couple of weeks I've noticed that I'm not able to get every e-mail message getting sent to me.

I noticed it when some really important messages just didn't arrive to me and caused the senders to phone me and ask if I received them.
I'm sure when I say 'no' they doubt it.

After a while I began to notice that my iPad was actually downloading these missing e-mails.

I've spent hours discussing with my internet provider (BT) who suggested it must be a problem with my e-mail client.

Anyone with BT will know they use a platform with Yahoo. I don't like their e-mail platform for loads of reasons. The major issue is that it's not quick and easy to manage multiple accounts all under one window and without the need to log into each account individually.

I had been using Windows Mail for ages and never had any issues.

I am now spending some time evaluating other e-mail clients to see if they can solve my problem

Now I'm trying out:-

- Mozilla Thunderbird
- Email Tray

Firstly, has anyone had similar problems to me ?
Does anyone know the root-causes and importantly the best solutions?

Secondly, what e-mail clients are others using that might help?

Thanks in advance.

PS: Please keep answers in plain English as I'm not computer literate