ATT.net email problem

I have att.net email which works thru Yahoo - for some reason it deletes or hides some of my mail that was in my INBOX - I haven’t deleted these emails but they are gone - yesterday I had over 60 in my INBOX and today there were 29 - only the most recent - some of the ones they deleted were quite important and now I don’t have any record of them.
Anyone else experience this problem with att.net??

Hi,
I’m sorry but I didn’t completely understand you. Are your emails missing in eM Client or on ATT.net (Yahoo)?

Regards,

Milos Kovalcik.

My emails are missing in ATT.net (yahoo).
In the INBOX - there one day, some are deleted after a certain amount of time (like 2 weeks)

Don’t you have option of “Remove from server after . days” checked in the Server settings section of the POP3 tab of your ATT.net account settings (menu Tools->Accounts)?