This is a corner case that doesn't happen in practice, but it can be created in
the test suite.

This reverts commit ffbcd3bf.

This applies to the vacation and notify actions, which produce new free-form
outgoing messages.

lib-sieve: enotify extension: mailto: Enforce subject header limit in Unicode codepoints rather than bytes.

It was "i;octet" previously, which is not standard.

This fixes a read overflow with Sieve environment extension accessing a
bare prefix, which might have ended up causing a crash. Currently, this
affected only attempting to access "vnd.dovecot.config" environment.

Found by Lintian

This commit removes the previously deprecated and now fully dropped
src_pos_r parameter from the base64_decode() function calls.

This also drops the trailing period from the log message, which matches the
changes to core.

This enables race-free kicking using socket+SIGTERM.

Pass IP structure to URL API instead of only the hostname as a string.

managesieve-login: managesieve-proxy - Allow parsing AUTHENTICATE response codes other than TRYLATER.