一年多以前，我通过SES使用CentOS和Sendmail设置了EC2实例。所有人都经过了测试，并且运行正常将近一年。但是现在由于某种原因，所有电子邮件都停止了发送。
邮件日志显示以下内容：
Jul 17 11:11:12 tippingapplications sendmail[3808]: x6HI9YBG003808: from=admin@tippingapplications.com, size=106, class=0, nrcpts=1, msgid=<201907171809.x6HI9YBG003808@tippingapplications.com>, relay=root@localhost
Jul 17 11:11:12 tippingapplications sendmail[3815]: x6HIBCHK003815: from=<admin@tippingapplications.com>, size=372, class=0, nrcpts=1, msgid=<201907171809.x6HI9YBG003808@tippingapplications.com>, proto=ESMTP, daemon=MTA, relay=localhost [127.0.0.1]
Jul 17 11:11:12 tippingapplications sendmail[3808]: x6HI9YBG003808: to=barry.ralphs@gmail.com, delay=00:01:38, xdelay=00:00:00, mailer=relay, pri=30106, relay=[127.0.0.1] [127.0.0.1], dsn=2.0.0, stat=Sent (x6HIBCHK003815 Message accepted for delivery)
Jul 17 11:11:12 tippingapplications sendmail[3817]: STARTTLS=client, relay=mx203.inbound-mx.org., version=TLSv1/SSLv3, verify=FAIL, cipher=AES256-SHA, bits=256/256
Jul 17 11:11:13 tippingapplications sendmail[3817]: x6HIBCHK003815: to=<barry.ralphs@gmail.com>, delay=00:00:01, xdelay=00:00:01, mailer=relay, pri=120372, relay=mx203.inbound-mx.org. [198.133.158.249], dsn=2.0.0, stat=Sent (Queued!)
我在SES信息中心中看不到任何已标记为已发送，已拒绝和退回的邮件。我的SES信誉信息中心显示正常。
任何帮助将不胜感激。