我已经关注https://www.digitalocean.com/community/tutorials/how-to-install-and-configure-postfix-as-a-send-only-smtp-server-on-ubuntu-22-04并在 Ubuntu 22.04 上配置了 postfix。但是，当我尝试使用以下命令进行测试时：
echo "This is the body of the email" | mail -s "This is the subject line" [email protected]
我在 /var/log/mail.log 上收到错误：
Oct 12 04:32:42 ip-172-31-2-101 postfix/anvil[88609]: statistics: max connection rate 1/60s for (smtp:133.144.233.206) at Oct 12 04:29:22
Oct 12 04:32:42 ip-172-31-2-101 postfix/anvil[88609]: statistics: max connection count 1 for (smtp:133.144.233.206) at Oct 12 04:29:22
Oct 12 04:32:42 ip-172-31-2-101 postfix/anvil[88609]: statistics: max cache size 1 at Oct 12 04:29:22
Oct 12 04:33:53 ip-172-31-2-101 postfix/pickup[87341]: 39EFF17C363: uid=1000 from=<[email protected]>
Oct 12 04:33:53 ip-172-31-2-101 postfix/cleanup[88723]: 39EFF17C363: message-id=<20221012043353.39EFF17C363@ip-172-31-2-101.ap-west-2.compute.internal>
Oct 12 04:33:53 ip-172-31-2-101 postfix/qmgr[87340]: 39EFF17C363: from=<[email protected]>, size=435, nrcpt=1 (queue active)
您能给我一些建议如何修复此类错误吗？谢谢。