Thunderbird rules/Network Security Policy for Comodo CIS 4.***

I am on a clean XP Pro SP2 system with Thunderbird Version (20090812) and Comodo CIS 4 using the firewall and sandbox but not the anti-virus part of it. That is use Avira

Thunderbird works fine for sending and receiving emails including big attachments. However I also read RSS feeds with it and have web-content being displayed inside Thunderbird. When I set the Network Security Policy for Thunderbird as Email Client I keep being asked to allow outgoing connections from thunderbird.exe. What additional rules can I set so that Thunderbird is being treated as an Email Client but also allows me to read RSS feeds and display other web-content inside it please?

All the outgoing request are over port 80, the internet port, so I guess this is not too hard to do but as I am a newbie considering network protocols I would not exactly be sure what rules to set. Perhaps a knowledgeable member can help me out here? I searched the forum for “thunderbird” and “thunderbird rules” but did not find what I am looking for, what is a but strange as I used to find those Thunderbird rules here pretty easy. Perhaps someone can point me in the right direction, thanks.


Try this:
1: ‘Firewall → Advanced → Predefined Firewall Policies’.

2: Double click on ‘Email Client’ and click Add and there:

Action = Allow
Protocol = TCP
Direction = Out
Description = (as you want)

Source Address = Any
Destination Address = Any
Source Port = Any
Destination Port = 80

3: And click Apply and so on…

4: If you are lucky, this might work :smiley:

You could also add port 443 in same way as above so TB could update add-ons and themes if you use such.

You have to move this rule(s) above the ‘Ask’ rule.

Thanks for this info

This is much appreciated, I’ll give it a go and report back.


You’re both welcome :wink:

I applied the two rules for port 80 and port 443 and it works!

I can read RSS Feeds and update Add-ons, just tried it and it works!


Nice to hear that it works, now I can sleep well.

As an addendum, port 443 (HTTPS) is also used in those rare cases when one has to log on on emailserver when SSL is used.

Good to hear about the SSL.