Avira and Thunderbird not working anymore

I upgraded my Avira Premium Security 2012 to Avira Internet Security 2012 (2013) and suddenly my Thunderbird stopped working for some of my email accounts. The IMAP servers were not working anymore, but the POP3 were fine. Thunderbird gave errors like „email address disconnected from server”.
I have sent an email to the Avira Support using their Avira Customer Service for Premium Products and got two emails.

First one was to ask me 3 questions:

  1. Do you access your mailbox through local email client (Eg. Microsoft Outlook, Mozilla Thunderbird) or Web based email (Eg. Hotmail, Yahoo, Gmail)?
  2. Do you configure your email client to use an SSL connection?
  3. Is Avira Mail Protection active on your system? (Open Avira Control Center and check the status)

My answer was:

  1. I am using Thunderbird
  2. I have IMAP accounts that are using SSL connection
  3. Avira Mail Protection is active

Shortly after sending the email I have received the solution:

Avira Mail Protection will not interfere with those email that is configured to use the SSL connection. Keep in mind, SSL or TLS is a cryptographic protocol, which is used to encrypt your mails in order to have a safe transfer from the server to your mail client. This means, by the design of SSL protocol, anyone or anything catching the mail on this delivery path will not be able to read it.

Avira Mail Protection is working between the server and the mail client. It is not possible to check the mail due to the fact that it is not able to decrypt it. The function of SSL protocol is to not allow anyone to read the mails.

To rectify this issue, please kindly follow the instruction given in the Support article below:

http://www.avira.com/en/support-for-home-knowledgebase-detail/kbid/935

On this page they state that Avira Antivirus Premium, Avira Internet Security and Avira Professional Security are blocking incoming Emails via SSL secure connections. To get the Email traffic working again, you have to check and correct the settings in the Email client.

  • Deactivate the option for using encrypted SSL/TLS connections for incoming and outgoing server
  • Make sure not to use the ports 25 (SMTP) and 110 (POP3) for SSL/TLS connections

But I need to send and receive emails via SSL or TLS connections, so I have changed the installed Avira product from the Control Panel, removing the Avira Mail Protection component.

In Windows 7 go to Start – Control Panel – Programs and Features. Right click on Avira and click „Change”, choose Modify and then follow the steps until you are on the Install Components screen where you can uncheck the Mail Protection.

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