Hello.

也许我不stand something.
Trying to get domainkey on my server.

192.168.6.1 - Mikrotik RB760iGS

ios版雷竞技官网入口
routerboard: yes
board-name: hEX S
model: RB760iGS
serial-number: A8150A06DE18
firmware-type: mt7621L
factory-firmware: 6.43.10
current-firmware: 6.46.1
upgrade-firmware: 6.47

package 6.47

Is it normal that the answers are different?

No. And there's definitely something weird. This exact query works fine with older RouterOS versions. I don't have 6.47 anymore, but with 6.47.1 and 6.48beta it fails completely. Packet sniffer shows that RouterOS sends query to upstream resolver, but ignores received answer and reports server failure to client.

Hello.
Sob, thanks for the answer.

Yes, I updated the firmware a week ago and found that my mail server began sending letters from mail.ru to spam.
This has not happened before.

X-Spam-Status: Yes, score=9.811 required=4 tests=[BAYES_00=-1.9,
DKIM_INVALID=0.1, DKIM_SIGNED=0.1,DMARC_FAIL_REJECT=9,
FREEMAIL_FROM=0.001, GB_FREEMAIL_DISPTO=0.499, HTML_MESSAGE=0.001,
RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_PASS=-0.001,
SPOOFED_FREEMAIL=1.999, SURBL_BLOCKED=0.001, T_SPF_TEMPERROR=0.01,

Authentication-Results: mail.test.com (amavisd-new); dkim=neutral
reason="invalid (public key: OpenSSL error: too long)"
header.d=mail.ru

I reconfigured the mail server to public DNS and everything began to work correctly.

It is strange that no one else has discovered such a situation.

It's a bug. I reported it in6.48beta thread, so it should get noticed and hopefully fixed soon.