v2.2.31 release candidate released

https://dovecot.org/releases/2.2/rc/dovecot-2.2.31.rc1.tar.gz https://dovecot.org/releases/2.2/rc/dovecot-2.2.31.rc1.tar.gz.sig

Unless new bugs are found, this will be the final v2.2.31 release, which will be released on Monday.

• LMTP: Removed "(Dovecot)" from added Received headers. Some installations want to hide it, and there's not really any good reason for anyone to have it.

• Add ssl_alt_cert and ssl_alt_key settings to add support for having both RSA and ECDSA certificates.
• pop3-migration plugin: Strip trailing whitespace from headers when matching mails between IMAP and POP3. This helps with migrations from Zimbra.
• acl: Add acl_globals_only setting to disable looking up per-mailbox dovecot-acl files.
• Parse invalid message addresses better. This mainly affects the generated IMAP ENVELOPE replies.

• v2.2.30 wasn't fixing corrupted dovecot.index.cache files properly. It could have deleted wrong mail's cache or assert-crashed.
• v2.2.30 mail-crypt-acl plugin was assert-crashing
• v2.2.30 welcome plugin wasn't working
• Various fixes to handling mailbox listing. Especially related to handling nonexistent autocreated/autosubscribed mailboxes and ACLs.
• Global ACL file was parsed as if it was local ACL file. This caused some of the ACL rule interactions to not work exactly as intended.
• auth: forward_* fields didn't work properly: Only the first forward field was working, and only if the first passdb lookup succeeded.
• Using mail_sort_max_read_count sometimes caused "Broken sort-* indexes, resetting" errors.
• Using mail_sort_max_read_count may have caused very high CPU usage.
• Message address parsing could have crashed on invalid input.
• imapc_features=fetch-headers wasn't always working correctly and caused the full header to be fetched.
• imapc: Various bugfixes related to connection failure handling.
• quota=imapc sent unnecessary FETCH RFC822.SIZE to server when expunging mails.
• quota=count: quota_warning = -storage=.. was never executed
• quota=count: Add support for "ns" parameter
• dsync: Fix incremental syncing for mails that don't have Date or Message-ID headers.
• imap: Fix hang when client sends pipelined SEARCH + EXPUNGE/CLOSE/LOGOUT.
• oauth2: Token validation didn't accept empty server responses.
• imap: NOTIFY command has been almost completely broken since the beginning. I guess nobody has been trying to use it.