The current version of CAS (2.6) is a bit buggy and has some design flaws. However if you use the work-arounds below, you should find that CAS works reasonably well. If any of these fixes don’t work, please do tell me so I can investigate and correct this FAQ. (The developers are currently working on fixing the problems for the CAS 2.7 release).
1. To avoid your friends being sent challenge emails
Install CAS with spam filtering disabled. When you run CAS for the first time set up the policy I describe as ‘assisted manual filtering’ in the relevant FAQ. Then ensure all your closest relatives and friends are on your white or authentication list(s) before enabling the challenge-response mode.
- One way to check you have included everyone is to sort and group your sent items list in your email client by the from address.
- Another which requires a bit more technical knowledge is to export all the email accounts in your sent items list as a .CSV file – CAS will de-duplicate it for you. Guidance here.
2. To increase the reliability of CAS - to prevent CAS/email client crashes
- Preferrably don’t set your computer to use standby or suspend mode. If you do don’t set your Outlook client to send/receive automatically. This is especially important if you have SSL accounts like Gmail. (N.B. if you switch off automated send/receive in your email client, becuase of the way CAS works, you may have to press send receive 2-3 times to download emails.)
- If you need to set your computer to send/receive automatically, make the frequency of send receives 15 minutes or more
- Don’t import email accounts into CAS if you don’t receive any spam via the accounts, especially if the accounts are SSL accounts.
3. If the CAS icon does not appear in the task bar
If CAS will not display its user interface when you try to open it from start/all programs
- If you are running Comodo EASYVPN try this fix here. Else try this fix here.
If CAS will display its user interface
4. If CAS does not import all your Outlook contacts’ emails
The CAS import facility only imports one email address per contact. Instead of using the Outlook import facility, export the email accounts from your contact book to a .csv file, and import this instead. Detailed guidance here.
5. If you find blocking entries is slow
Turn off spam reporting on the Advanced/Miscellaneous section
6. If its taking time for approved emails to get through
Be patient! CAS takes 2-3 send/receives to process and pass through emails
7. If spam mails with your address as the ‘from’ address are being passed through
Remove your name from the relevant email account’s authentication list. Make sure you have not set up other software (eg routers, firewall monitors, backup software) to send email ‘from’ your email address ‘to’ your email address. (You can normally change these to use a fake address as their ‘from’ address eg myrouter[at]validdomain.com).
8. If spam mails with no sender’s address are being passed through. Export the authentication database relating to the relevant account to a .bwl file using the process described here in the re-installation FAQ. (But do not re-install CAS!). Edit this file using a text editor such as notepad or wordpad. Add the following string, without the inverted commas as the first line of the authentication database ‘:2:0’. Save the file, then import it into CAS as described in the re-installation FAQ. CAS should register one new entry imported. Subsequently emails with a blank address will be trapped in quarantine with a status of pending and can be manually deleted. Unfortunately Outlook read receipts will also be trapped. (NB This work around has only been tested for a short period).
9. If you have problems with SSL accounts like Gmail
Either set up the accounts manually guided by the relevant FAQ. Or delete and re-import the accounts, making sure you say ‘yes’ when asked whether CAS should adjust your client’s account settings.
10. If you are receiving duplicate copies of emails
If your email accounts are set to ‘keep copies of downloaded emails on the server’ when you install CAS it downloads the copies kept on the server. (This is because the server sees CAS as a new email client). It’s probably best just to ignore this if it only happens on installation. If it continues to happen after installation it can be resolved by setting your email accounts not to keep copies on the server. (‘Keeping copies’ is a server setting for Gmail, and an email client plus CAS setting in most other cases). Or, if you are using a power-saving suspend/standby mode, turning off automated sends/receives. If you don’t mind installing extra software a workaround that addresses this problem at its root is to install processtamer from here, and set it to upgrade the priority of c:\program files\comodo\antispam\casproc.exe to ‘normal’ or ‘8’ immediately it runs. The other workarounds for this bug are then not necessary.
11. If emails in your quaratine database are passed to your email client without you asking.
Either turn off your computer’s ability to go into standby/hibernation mode. Undesirable from a climate change perspective!). Or turn off automated send/receive in your email client and ensure that you don’t press send/receive for 5 minutes after the computer has emerged from standby or hibernation.
12. If you are receiving too many delivery/faillure reports relating to CAS challenge/response emails
Since you know the content of the original email these messages can be reliably processed into a separate folder if your email client supports email processing rules. In Outlook 2003 the following rule works well:
Apply this rule after the message arrives
With ‘delivery filed’ or ‘undeliverable email’ or ‘delivery failure’ or ‘returned mail’ or ‘delivery status notification (failure)’ or ‘email error’ or ‘failure notice’ or ‘returned email’ or ‘Delivery Notification: Delivery has failed’.
And with antispam passcode in the body
And on this machine only
Move it to the Delivery/failure receipts folder