Email scanner notifications pop ups

Judith, Have a look @ this link (https://support.avg.com/answers?id=906b0000000D3m2AAC).
AVG Guru

How can I remove the folloing pop up notifications please?
Email scanner is unable to scan because of encrypted content …No messages are encrypted!

Judith, Have a look @ this link (https://support.avg.com/answers?id=906b0000000D3m2AAC).
AVG Guru