This could have happened with Maildir/mbox and autoexpunging.
Mimics Dovecot/IMAP change ddffbb277e212adb9d594b3d7d1e1d39fa78f7c6.

Mimics Dovecot/IMAP change 1001bda65e9f592d852a26ddd6a993f7973050bf.

The recipient_delimiter is treated as multiple one-character delimiters
rather than one multi-character delimiter if more than one character is
supplied.

Based on a patch by: Lennart Weller <lhw@ring0.de>

Stream errors were never logged properly.
Streams now have a name that makes sense.
Timeout errors were handled in a rather stupid fashion.

The previous change prompted some futher code review and similar improvements/fixes were applied at various places in the code.

If header was truncated, it was treated as an istream error. Also the
istream read errors weren't logged.

This caused a Coverity defect report.

This caused Coverity defect reports.

lib-sieve: validator: Fixed potential NULL dereference in sieve_validator_extensions_check_conficts().

Would only happen with dummy/internal `extensions' that have no valid ID.
This caused a Coverity defect report.

Would only happen with dummy/internal `extensions' that have no valid ID.
This caused a Coverity defect report.

This caused a coverity defect report.

Otherwise, these would be re-parsed every time a new mail_user is created (e.g. when opening a mail as raw).

This should have provoked a compiler warning.

These are not available under that name anymore and when the replacing extension has the same bare name, this would have led to duplicate capabilities.

lib-sieve: vnd.dovecot.report extension: Made the report action behave correctly when there is no envelope.

lib-sieve: enotify: mailto: Sending a notification still partly depended on having an envelope available.

This is used mainly when no other means of obtaining the user's email is available, such as when there is no envelope (in IMAP).
Before, the postmaster address or the null "<>" address was used as a fallback for sending messages.
The redirect and enotify commands can be explicitly configured to use what is configured with sieve_user_email.

Used wrong type in sizeof().