hMailServer

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hMailServer is a free, open source, e-mail server for Microsoft Windows. Any webmail system which supports IMAP, SMTP and POP3 can be used with
hMailServer. It has flexible score- based spam protection and can attach to your virus scanner to scan all incoming and outgoing email. hMailServer comes
with a set of built-in anti spam features such as SPF, SURBL. We have made sure the image is hardened so it secured from all existing vulnerabilities. In addition to this we also provide patch management solution which can be enabled on these instances as you take them to production using our PatchManagement solution. You can learn more about our PatchManagement
solution from https://www.patchawscloud.com/saasconsole.