小编pwz*_*000的帖子

我设置了 PTR 记录，但无法将邮件发送到 Gmail 帐户：

host gmail-smtp-in.l.google.com[2607:f8b0:4004:c08::1b] said: 
550-5.7.25 [2a01:4ff:f0:a7b6::1] The IP address sending this message does not
550-5.7.25 have a PTR record setup, or the corresponding forward DNS entry does 
550-5.7.25 not point to the sending IP. As a policy, Gmail does not accept 
550-5.7.25 messages from IPs with missing PTR records. Please visit
550-5.7.25  https://support.google.com/mail/answer/81126#authentication for more 
550-5.7.25 information.
u1-20020ac87501000000b00315c38791casi6985465qtq.683 - gsmtp (in reply to end of DATA command)

有人可以指导我如何正确设置我的 PTR 记录吗？我托管在 Hetzner Cloud 上，并使用 Rainloop 创建电子邮件帐户。