An icon from Tango Project. Since version 0.8.90 Tango Project icons are Public Domain. 探戈 图标 网络 探戈网络接收
"Mail send/receive" icon from Tango Project Since version 0.8.90 Tango Project icons are Public Domain: Tango Project FAQ 探戈 图标 邮件 探戈邮件发送接收