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.

The wiki is obsolete and most of the pages have been linking to the
updated documentation pages anyways.

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.

With set -e, the script ends on any nonzero exit code and that would
leave the valgrind output unchecked. Fix the exit code capture so
valgrind output is correctly shown.

Found by Lintian

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