public void writeTerminatingSequence() throws IOException {
		if (lastBytes[0] == '\r' && lastBytes[1] == '\n') {
			super.write(DOT_CRLF);
		} else {
			super.write(CRLF_DOT_CRLF);
		}
	}
Writes ". CR LF" to the wrapped stream, but prefixes it with another CR LF
sequence if it is missing from the end.

@throws IOException on IO error
src/main/java/de/gessnerfl/fakesmtp/smtp/io/DotTerminatedOutputStream.java