Google cloud platform 使用Sendgrid在GCP Google云VM上获得后缀反弹-发件人未送达通知

我在GCP虚拟机上运行Debian 8。尝试使用Sendgrid SMTP服务发送带有后缀的电子邮件，但我收到了反弹，并且没有收到任何电子邮件

我遵循了文档和说明，但不确定问题在哪里

我尝试使用apikey方法以及用户名/密码，但两者都不起作用

文件：

下面是系统日志消息

May  4 23:30:20 elegant-dxlhoa-logintry-vm systemd[1]: Stopping System Logging Service...
May  4 23:30:20 elegant-dxlhoa-logintry-vm systemd[1]: Starting System Logging Service...
May  4 23:30:20 elegant-dxlhoa-logintry-vm systemd[1]: Started System Logging Service.
May  4 23:30:31 elegant-dxlhoa-logintry-vm postfix/pickup[4953]: 9F834A0CF7: uid=0 from=<root@elegant-dxlhoa-logintry-vm.c.elegant-dxl-dream.internal>
May  4 23:30:31 elegant-dxlhoa-logintry-vm postfix/cleanup[4976]: 9F834A0CF7: message-id=<20180504233031.9F834A0CF7@dxlhoa-vm.c.dxl-dream.internal>
May  4 23:30:31 elegant-dxlhoa-logintry-vm postfix/qmgr[4954]: 9F834A0CF7: from=<root@elegant-dxlhoa-logintry-vm.c.elegant-dxl-dream.internal>, size=428, nrcpt=1 (queue active)
May  4 23:30:31 elegant-dxlhoa-logintry-vm postfix/error[4978]: 9F834A0CF7: to=<ctg.cloudtechguy@gmail.com>, relay=none, delay=0.01, delays=0.01/0/0/0, dsn=5.0.0, status=bounced ([smtp.sendgrid.net]:2525)
May  4 23:30:31 elegant-dxlhoa-logintry-vm postfix/cleanup[4976]: A1BA6A0D0A: message-id=<20180504233031.A1BA6A0D0A@dxlhoa-vm.c.dxl-dream.internal>
May  4 23:30:31 elegant-dxlhoa-logintry-vm postfix/bounce[4980]: 9F834A0CF7: sender non-delivery notification: A1BA6A0D0A
May  4 23:30:31 elegant-dxlhoa-logintry-vm postfix/qmgr[4954]: 9F834A0CF7: removed
May  4 23:30:31 elegant-dxlhoa-logintry-vm postfix/qmgr[4954]: A1BA6A0D0A: from=<>, size=2434, nrcpt=1 (queue active)
May  4 23:30:31 elegant-dxlhoa-logintry-vm postfix/error[4978]: A1BA6A0D0A: to=<root@elegant-dxlhoa-logintry-vm.c.elegant-dxl-dream.internal>, relay=none, delay=0.02, delays=0/0/0/0.02, dsn=5.0.0, status=bounced ([smtp.sendgrid.net]:2525)
May  4 23:30:31 elegant-dxlhoa-logintry-vm postfix/qmgr[4954]: A1BA6A0D0A: removed
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如果有人能帮忙，我将不胜感激

谢谢 TP

如中所述，您可以运行以下命令以确保与SendGrid的SMTP中继连接

telnet smtp.sendgrid.net 2525

另外，请访问以获取有关Linux机器上SendGrid的Postfix配置的一些提示

telnet smtp.sendgrid.net 2525