我正在尝试在 Linux 服务器上配置 Postfix，但当我尝试发送测试电子邮件时，它生成了以下错误。有人能帮我解决这个问题吗？我将不胜感激。
这是我的main.cf：
smtpd_banner = $myhostname ESMTP $mail_name ($mail_version)
biff = no
append_dot_mydomain = no
readme_directory = no
# TLS parameters
smtpd_tls_cert_file=/etc/ssl/certs/ssl-cert-snakeoil.pem
smtpd_tls_key_file=/etc/ssl/private/ssl-cert-snakeoil.key
smtpd_use_tls=yes
smtpd_tls_session_cache_database = btree:${data_directory}/smtpd_scache
smtp_tls_session_cache_database = btree:${data_directory}/smtp_scache
smtpd_relay_restrictions = permit_mynetworks permit_sasl_authenticated defer_unauth_destination
myhostname = instance-1
alias_maps = hash:/etc/aliases
alias_database = hash:/etc/aliases
myorigin = /etc/mailname
mydestination = instance-1.c.test-72e61.internal, localhost.c.test-72e61.internal, localhost
relayhost = [smtp.c.test-72e61.internal]
mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128
mailbox_size_limit = 0
recipient_delimiter = + .
inet_interfaces = all
Dec 18 10:03:56 instance-1 postfix/qmgr[30463]: CF257675A6: from=<[email protected]>, size=408, nrcpt=1 (queue active)
Dec 18 10:03:56 instance-1 postfix/qmgr[30463]: 397F5675B3: from=<[email protected]>, size=414, nrcpt=1 (queue active)
Dec 18 10:03:56 instance-1 postfix/smtp[31477]: warning: relayhost configuration problem
Dec 18 10:03:56 instance-1 postfix/smtp[31476]: warning: relayhost configuration problem
Dec 18 10:03:56 instance-1 postfix/smtp[31476]: CF257675A6: to=<[email protected]>, relay=none, delay=239771, delays=239770/0.01/0.02/0, dsn=4.3.5, status=deferred (Host or domain name not found. Name service error for name=smtp.c.test-72e61.internal type=AAAA: Host not found)
Dec 18 10:03:56 instance-1 postfix/smtp[31477]: 397F5675B3: to=<[email protected]>, relay=none, delay=239658, delays=239658/0.01/0.01/0, dsn=4.3.5, status=deferred (Host or domain name not found. Name service error for name=smtp.c.test-72e61.internal type=AAAA: Host not found)