找不到後綴 MX 主機

我正在嘗試使用 Postfix 發送郵件，但我收到所有電子郵件的以下錯誤：

May 13 12:44:46 myhost postfix/qmgr[12169]: A6D9644526: from=<x@y.com>, size=317, nrcpt=1 (queue active)

May 13 12:44:46 myhost postfix/smtp[12178]: A6D9644526: to=<z@gmail.com>, relay=none, delay=0.03, delays=0.02/0/0/0, dsn=4.4.3, status=deferred (Host or domain name not found. Name service error for name=gmail.com type=MX: Host not found, try again)

閱讀連結的問題，我已經檢查過/etc/resolv.conf，/var/spool/postfix/etc/resolv.conf它們都是相同的。我的resolv.conf樣子：

nameserver 2001:4b98:dc0:49::225
nameserver 217.70.184.225
nameserver 217.70.184.226
options timeout:1 attempts:3 rotate

dig mx gmail.com作品：

; <<>> DiG 9.9.5-3ubuntu0.8-Ubuntu <<>> mx gmail.com ;; global
options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status:
NOERROR, id: 64383 ;; flags: qr rd ra; QUERY: 1, ANSWER: 5, AUTHORITY:
4, ADDITIONAL: 15

以下是 的內容/etc/postfix/main.cf：

smtpd_banner = $myhostname ESMTP $mail_name (Ubuntu)
biff = no

append_dot_mydomain = no

readme_directory = no

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 = myhost
alias_maps = hash:/etc/aliases
alias_database = hash:/etc/aliases
myorigin = /etc/mailname
mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128
mailbox_size_limit = 0
recipient_delimiter = +
inet_interfaces = all
inet_protocols = ipv4

知道為什麼找不到郵件主機嗎？

似乎錯誤是由於 /etc/resolv.conf 中的 ipv6 地址引起的。我刪除了它，它現在可以工作了。

引用自：https://unix.stackexchange.com/questions/282966