Hello Lim.
We'll certainly look into this and help you resolve it. Are you using any email client like Outlook or Thunderbird to send and receive emails, or is it a web based email? To further narrow down the issue, I'd request to disable each AVG component individually and try sending the emails.
Click this link for steps to disable each AVG component.
Why I cannot send out email after installing AVG Ultimate?
Hello Lim.
We'll certainly look into this and help you resolve it. Are you using any email client like Outlook or Thunderbird to send and receive emails, or is it a web based email? To further narrow down the issue, I'd request to disable each AVG component individually and try sending the emails.
Click this link for steps to disable each AVG component.