寄信到gmail被退信，DNS新增SPF紀錄可解決

錯誤訊息

Remote server replied: 550-5.7.26 This mail is unauthenticated, which poses a security risk to the

550-5.7.26 sender and Gmail users, and has been blocked. The sender must

550-5.7.26 authenticate with at least one of SPF or DKIM. For this message, 550-5.7.26 DKIM checks did not pass and SPF check for

今天終於拿到DNS管理帳密，登入twnic找到DNS管理，新增一筆 TXT紀錄
Value: v=spf1 ip4:192.168.x.x 如下圖(此ip為對外發信實體IP)，這樣就解決啦。