global: don't cast NULL to void * NULL is guaranteed to be a void * thanks to dd6043c05e32a8e8db1233ed711a2c74d1477a89.

Updated copyright notices to include the year 2018.

lib-smtp: smtp-submit: Added SSL support.

lib-smtp: smtp-submit: Use mail_debug setting to enable debug logging. When sendmail is used, this logs program_client debug messages. When SMTP is used (submission_host), this logs smtp_client debug messages.

lib-smtp: smtp-submit: Changed submission_host implementation to use lib-smtp/smtp-client.

lib-smtp: smtp-submit: Small whitespace fix.

lib-smtp: smtp-submit: Remove erroneously copy-pasted FIXMEs.

global: Avoid i_stream_is_eof() where it's not necessary

lib-smtp: smtp-submit: Made submission_timeout a setting rather than a function parameter. This makes it configurable.

global: remove unnecessary ENOENT checks from unlink_directory() calls

global: start relying on [io]_stream_unref(NULL) being a no-op Cleanup performed with the following semantic patch: @@ expression E; @@ - if (E != NULL) { - i_stream_unref(&E); - } + i_stream_unref(&E); @@ expression E; @@ - if (E != NULL) { - o_stream_unref(&E); - } + o_stream_unref(&E);

lib-smtp: test-smtp-submit: Fixed memory leak in one test.

lib-smtp: test-smtp-submit: Improved checking of delivered message. This addresses a couple of scan-build "dead assignment" warnings.

lib-smtp: smtp-submit: Added support for asynchronous message submission.

lib-lda: Moved smtp-submit to lib-smtp.