protected void writeChunk(final byte[] buffer, final int offset, final int length) throws IOException {
		this.out.write(buffer, offset, length);
	}
Provides an extension point for ExtraDotOutputStream to be able to add dots
at the beginning of new lines.

@see java.io.FilterOutputStream#write(byte[], int, int)
src/main/java/de/gessnerfl/fakesmtp/smtp/io/CRLFOutputStream.java