Changed: Updated Windows Defenders integration to include .DAT and .DAT2.
Changed: When installing SmarterMail and choosing to "Use existing IIS site", all subweb sites are now hidden as SmarterMail only supports top-level configurations.
Fixed: "All But Specified Countries" in the system-level "Block Authentication by Country" setting does the reverse.
Fixed: "Disable insecure auth methods for non-SSL authentication" setting doesn't disable the plain-text authentication options for POP and IMAP.
Fixed: A looping issue with acme status lookup.
Fixed: A unique issue where Outlook mobile (EAS) isn't syncing a user's account.
Fixed: Accepting a calendar share in Outlook (MAPI) results in an error.
Fixed: Alias members are displayed as BCC recipients in Message Archiving.
Fixed: An issue where "Relay is denied" delivery errors occur due to mishandled MX/A record lookups.
Fixed: Archived messages do not display CC field even though it is stored in the EML.
Fixed: BIMI images are not displaying for internal messages.
Fixed: Cleared up various smaller issues with DKIM signing.
Fixed: DKIM signatures from version 15.x cause signing exceptions after upgrade.
Fixed: DKIM signing fails when Bcc fields are in header and DKIM setting are set to "All Headers".
Fixed: Error logs show "Value cannot be null" with no details on what this pertains to.
Fixed: Group Chat (XMPP) doesn't work in Firefox: shows "Chat is currently unavailable or has been disabled on the server."
Fixed: Internal users can see who is in the BCC of emails.
Fixed: Issue with Negotiate authentication for the HTTP endpoints.
Fixed: Occasional instances of doubling of Calendar and Contacts folders (MAPI).
Fixed: Reverting SmarterMail servers to a checkpoint can damage SSL deployment.
Fixed: Sending email to aliases via Outlook (IMAP/SMTP) generates an exception in the resulting Delivery session.
Fixed: Some contact groups do not sync member data to Outlook (MAPI).
Fixed: Stopping SmarterMail IIS site/application pool/service for an upgrade results in exceptions in Windows Event Viewer.
Fixed: Using the Share Calendar feature in Outlook (MAPI) results in blank sender details on the recipient's end.
Fixed: When sending mail through Fastmail as an SMTP client DKIM will fail.
Fixed: When sending to a domain alias address, "Inbound Message Delivery = External (use MX record)" is delivering locally, despite no local user residing on the server.
