GrayWall 1.2.1 could be downloaded from the developer's website when we last checked. We cannot confirm if there is a free download of this software available. This free tool was originally produced by Ararat s.r.o.
This PC program can be installed on 32-bit versions of Windows XP/XP Professional/Vista/7/8/10/11. The most popular versions of the program 1.2 and 1.0. According to the results of the Google Safe Browsing check, the developer's site is safe. Despite this, we recommend checking the downloaded files with any free antivirus software. The software is categorized as Internet & Network Tools.
From the developer:
This is a program that adds a grey list feature to the Mercury/32 SMTP server and it uses the Mercury/32 API facility. It accepts some incoming SMTP sessions and rejects others according to certain conditions and authorized connections, or connections from specified IP addresses, are not affected by Graywall.
You may want to check out more software, such as FTPGetter, FTP Commander Deluxe or Check Point VPN-1 SecuRemote/SecureClient NGX R60 HFA1, which might be similar to GrayWall.