Your computer or virtual machine requires a minimum of 8 GB RAM and an 120GB hard drive for use in testing and demonstration environments.
Clearswift recommends a minimum of 16 GB RAM and 200 GB hard drive for use in a production environment based on your storage and processing requirements.
For a production environment, Clearswift recommends the following based on your storage and processing requirements where your Secure ICAP Gateway is configured so that your policy has:

– 1 Anti-Virus Scanner

We recommend increasing the size by a minimum of 25% if you intend to store message-tracking data for 2 years.

Please ensure you are using the correct version of the ISO image:

• EMAIL-5.6.0.iso . After downloading the ISO image, it is recommended that an MD5/SHA hash is generated and compared to the published hashes from the download area. 

After you download a copy of the ISO image from the online Clearswift product
download area, there are a number of ways you can use it to install the software:

• Copying the ISO image to USB media. 
• Attaching the ISO image as a virtual DVD drive. This applies to virtual
  machines only.

The Clearswift Secure Email Gateway supports connections using TLS 1.2
ciphers and has been tested with the following browsers:

– Mozilla Firefox – latest
– Google Chrome – latest
– Microsoft Edge (Windows 10)