problems with possible compromised email on my desk top - Microsoft Community

i have lenovo computer , use windows 8.

i use yahoo.com business emails.    today started getting email messages show retruned emails not deliverable    (mailer deamon).   went on until received guess whole contact list approx. 387 listings.

i didn't send emails out myself, started rolling in.       deleted of emails, now when send email out, comes undeliverable due suspicious activity.

however if send same email i-phone don't have trouble.   feel corrupt desk top, but norton protection shows well?

any suggestions?  

hi kenny,

for isolate issue, allow know more information.

• how access yahoo email? using email client?
• have done updates computer prior issue?
• what browser did use in accessing site?
• have tried using browser?
• have tried clearing caches on computer?

we wait reply.

regards.

Windows / Windows 8.1 / Email & communications / Mail app