Google G Suite DMARC + SPF + DKIM 用户域别名失败 Google Admin Toolbox CheckMX

Google G Suite DMARC + SPF + DKIM 用户域别名失败 Google Admin Toolbox CheckMX

我已经在我的 Google 旧 G-Suite 帐户中为用户域别名设置了上述内容,但仍然收到两条警告消息:

https://webcoder.co.uk

There were some non-critical problems detected with the configuration of this domain.
Depending on how you configured your mail-flow, this could be a source of mail delivery issues. 

DKIM is not set up. warning [this one always appears in yellow]

TXT lookup should fit in one UDP response packet.

https://toolbox.googleapps.com/apps/checkmx/check?domain=webcoder.co.uk

我已根据其他成功验证的工具正确设置了 SPF 和 DKIM,并且 DNS 中只有少数必要条目:

# dig webcoder.co.uk any

; <<>> DiG 9.16.1-Ubuntu <<>> webcoder.co.uk any
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 13051
;; flags: qr rd ra; QUERY: 1, ANSWER: 11, AUTHORITY: 0, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 65494
;; QUESTION SECTION:
;webcoder.co.uk.            IN  ANY

;; ANSWER SECTION:
webcoder.co.uk.     86400   IN  A   176.58.127.176
webcoder.co.uk.     86400   IN  NS  ns1.tsodns.com.
webcoder.co.uk.     86400   IN  NS  ns2.tsodns.com.
webcoder.co.uk.     86400   IN  SOA ns1.tsodns.com. support.tsohost.com. 1628681639 10800 3600 604800 3600
webcoder.co.uk.     86400   IN  MX  1 ASPMX.L.GOOGLE.com.
webcoder.co.uk.     86400   IN  MX  5 ALT1.ASPMX.L.GOOGLE.com.
webcoder.co.uk.     86400   IN  MX  5 ALT2.ASPMX.L.GOOGLE.com.
webcoder.co.uk.     86400   IN  MX  10 ALT3.ASPMX.L.GOOGLE.com.
webcoder.co.uk.     86400   IN  MX  10 ALT4.ASPMX.L.GOOGLE.com.
webcoder.co.uk.     86400   IN  TXT "google-site-verification=oYfc0eoSUnoeUBYoTYKS9qIUlUlw6cHk6IWdC4UfTCc"
webcoder.co.uk.     86400   IN  TXT "v=spf1 include:_spf.google.com ~all"

;; Query time: 19 msec
;; SERVER: 127.0.0.53#53(127.0.0.53)
;; WHEN: Wed Aug 11 13:00:02 BST 2021
;; MSG SIZE  rcvd: 401


# dig webcoder.eu any

; <<>> DiG 9.16.1-Ubuntu <<>> webcoder.eu any
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 63301
;; flags: qr rd ra; QUERY: 1, ANSWER: 12, AUTHORITY: 0, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 65494
;; QUESTION SECTION:
;webcoder.eu.           IN  ANY

;; ANSWER SECTION:
webcoder.eu.        86400   IN  A   176.58.127.176
webcoder.eu.        3600    IN  NS  ns51.domaincontrol.com.
webcoder.eu.        3600    IN  NS  ns52.domaincontrol.com.
webcoder.eu.        3600    IN  SOA ns51.domaincontrol.com. dns.jomax.net. 2021081123 28800 7200 604800 3600
webcoder.eu.        604800  IN  MX  20 alt1.aspmx.l.google.com.
webcoder.eu.        604800  IN  MX  30 alt2.aspmx.l.google.com.
webcoder.eu.        604800  IN  MX  10 aspmx.l.google.com.
webcoder.eu.        604800  IN  MX  40 aspmx2.googlemail.com.
webcoder.eu.        604800  IN  MX  50 aspmx3.googlemail.com.
webcoder.eu.        86400   IN  TXT "v=spf1 include:_spf.google.com ~all"
webcoder.eu.        86400   IN  TXT "MS=ms50869792"
webcoder.eu.        86400   IN  TXT "google-site-verification=mq-5iDOSGsTY1whcBFqWbq6DXAy9WfD9YpXlDGU3Qyg"

;; Query time: 79 msec
;; SERVER: 127.0.0.53#53(127.0.0.53)
;; WHEN: Wed Aug 11 13:00:50 BST 2021
;; MSG SIZE  rcvd: 445

另一方面,当我检查我的主域名 webcoder.eu 时,得到的要么是成功验证(全部为绿色),要么是间歇性的 UDP 错误:

error (in red):

    MX lookup must fit in one UDP response packet.

    Overly large MX response will cause problems for many senders. To avoid this, either decrease the number of MX records or shorten their names

warning appeared only a couple of times (yellow):

    DKIM is not set up. warning

    TXT lookup should fit in one UDP response packet.

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