Webmail over HTTPS for domains whose website is hosted elsewhere: when only mail and webmail.<domain> point at this server, webmail.<domain> can be ticked under Let's Encrypt on the website's SSL/TLS page (and free SSL adds it by itself); the webmail then uses any certificate of the subscription that covers it. Domains with mail also get webmail.<domain> offered for their own certificates.
SSL/TLS: mail (SMTP, IMAP, POP3) and FTPS present one certificate for the whole server. On a website's SSL/TLS page, Certificates of mail and FTP now lists only server pool certificates and explains this; choosing a website's own certificate gave an unclear error. Also includes 0.17.16: on Windows Server 2016 the installer installs .NET Framework 4.8.
Windows Server 2016: the installer now installs .NET Framework 4.8 from Microsoft (download signature checked) when the server still has 4.6.2, before adding IIS, so ASP.NET 4.8 sites run. Restart Windows when the installer asks, to finish it. No change for Windows Server 2019, 2022 and 2025.
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