下午好。ubuntu 22.04 上有一个邮件服务器（smtp 中继）。这是服务器的核心。Google Workspace 上有邮件帐户，并且配置了从这些帐户向创建的 smtp 服务器传输外发信件。从公司邮箱（Google 工作区）发送的所有内容都没有问题，中继工作正常。但是，当我尝试将邮件（从任何邮箱）发送到公司邮箱时，我收到一条错误消息“example.com 的邮件循环回到我自己”。
我提供我的服务器配置。Ubuntu 22.04 Postfix 版本 3.6.4
您能指出问题出在哪里吗？谢谢
主配置文件
# See /usr/share/postfix/main.cf.dist for a commented, more complete version
# Debian specific: Specifying a file name will cause the first
# line of that file to be used as the name. The Debian default
# is /etc/mailname.
#myorigin = /etc/mailname
smtpd_banner = $myhostname ESMTP $mail_name (Ubuntu)
biff = no
# appending .domain is the MUA's job.
append_dot_mydomain = no
# Uncomment the next line to generate "delayed mail" warnings
#delay_warning_time = 4h
readme_directory = no
# See http://www.postfix.org/COMPATIBILITY_README.html -- default to 3.6 on
# fresh installs.
compatibility_level = 3.6
# TLS parameters
smtpd_tls_cert_file=/etc/letsencrypt/live/example.com/fullchain.pem
smtpd_tls_key_file=/etc/letsencrypt/live/example.com/privkey.pem
smtpd_tls_security_level=may
smtp_use_tls=yes
smtp_tls_CApath=/etc/ssl/certs
smtp_tls_security_level=may
smtp_tls_session_cache_database = btree:${data_directory}/smtp_scache
smtpd_sender_restrictions = permit_sasl_authenticated, permit_mynetworks, check_relay_domains
myhostname = mail.example.com
mydomain = mail.example.com
alias_maps = hash:/etc/aliases
alias_database = hash:/etc/aliases
mydestination = $myhostname, localhost.$mydomain, localhost, example.com
relayhost =
relay_domains = gmail.com, google.com, mail.example.com
mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128 35.190.247.0/24 64.233.160.0/19 66.102.0.0/20 66.249.80.0/20 72.14.192.0/18 74.125.0.0/16 108.177.8.0/21 173.194.0.0/16 209.85.128.0/17 216.58.192.0/19 216.239.32.0/19 [2001:4860:4000::]/36 [2404:6800:4000::]/36 [2607:f8b0:4000::]/36 [2800:3f0:4000::]/36 [2a00:1450:4000::]/36 [2c0f:fb50:4000::]/36 172.217.0.0/19 172.217.32.0/20 172.217.128.0/19 172.217.160.0/20 172.217.192.0/19 172.253.56.0/21 172.253.112.0/20 108.177.96.0/19 35.191.0.0/16 130.211.0.0/22
mailbox_size_limit = 0
recipient_delimiter = +
inet_interfaces = all
inet_protocols = ipv4
milter_protocol = 2
milter_default_action = accept
smtpd_milters = inet:localhost:8891
non_smtpd_milters = inet:localhost:8891
DNS 域记录：
example.com
MX
5 alt2.aspmx.l.google.com.
5 alt1.aspmx.l.google.com
10 alt4.aspmx.l.google.com.
2 aspmx.l.google.com.
10 alt3.aspmx.l.google.com.
1 mail.example.com
mail.example.com
A
0.0.0.0(example)