nMail.Attachment.SetHeaderSize C# (CSharp) Method

        protected void SetHeaderSize()
        {
            if(_header_size < 0)
            {
                _header_size = Options.HeaderMax;
            }
            if(_header_size <= 0)
            {
                _header_size = HeaderSize;
                Options.HeaderMax = _header_size;
            }
        }