What the upgrade involved

Schema 6030 to 6031: one column on hm_fetchaccounts, added by the installer's database upgrade on every backend. From 6.2.25 or 6.2.26, run the installer. From earlier, read the 6.2.25 and 6.2.24 notes first.

Security

• A missing DS is now proved missing (RFC 4035 §5.2, RFC 5155 §8). The resolver keeps the authority section of a negative answer and requires the parent's proof there: an NSEC at the delegation name with NS set and DS clear, an NSEC3 whose hashed owner matches with the same bits, or an Opt-Out NSEC3 covering the hash, each signed by the parent's key.
• A proof that fails to verify, has expired, claims a DS exists, or belongs to another name is no proof, and a delegation without one under a signed parent is now Bogus and blocked rather than Insecure. An unsigned parent, or a resolver that cannot be reached, still yields Insecure. The chain result is exposed as Diagnostics.DnssecChainStatus.

Mail flow

• FetchAccount.MirrorFolders (schema 6031; "Mirror every folder" on an IMAP external account in the Control Panel) collects each remote mailbox into the local folder of the same name: every message byte for byte, with its \Seen \Flagged \Answered \Draft \Deleted flags, its internal date, and the remote hierarchy delimiter mapped to the local one. Nothing is delivered, so no rule, anti-spam or anti-virus touches a copy. Each folder records what it has collected, so a second poll takes only what is new. Days to keep messages 0 makes it a move.
• The Import Tool reads a Maildir: the INBOX and every Maildir++ folder beside it, with the flags the file names carry (;2, and !2, as well as :2,) and line endings made CRLF.
• An import into a folder a client has open now refreshes it, as a delivery does.
• Migration.md documents each route in and what it keeps: IMAP, mbox, Maildir, Outlook through IMAP (PST is deliberately not parsed), and bulk accounts.

Full release notes, checksums and signatures