I cannot send email

AVG Performance
3

Hello Marianne,
We regret the inconvenience caused. We'll check and help you.
We'd like to inform you that we are aware of this issue. We've sent you an email with further details. Please check your inbox/spam folders to find the email and use it to get back to us.
Thank you and keep us updated.

1

All was working fine until yesterday and now I can't send emails The  AVG. Error is:
The following recipient cannot/cannot be achieved:

I assume you have done an update and now we have issues.  

2

Hello Marianne,
We regret the inconvenience caused. We'll check and help you.
We'd like to inform you that we are aware of this issue. We've sent you an email with further details. Please check your inbox/spam folders to find the email and use it to get back to us.
Thank you and keep us updated.