Gmail reject emails sent from my domain: due to the very low reputation

The MW

12/12/22, 12:15 AM

We have been using our SMTP server to send emails to our clients for a few years, all of a sudden, gmail rejected them all. We have not changed anything, server is not compromised, and we don't send spam emails. We only send about 100-200 emails to our clients per day.

I checked spf, dkim, dmarc etc, all look good.

So how to fix this?

Google has a postmaster tool, I have verified the domain and the smtp server.

Strange thing is, it started 3 days ago. About 2 hours ago, I was able to send an test email to my own personal gmail account (it resulted in spam, and I clicked "report not spam"). Now when I try it, it got rejected again.

This is the message I am getting

<[email protected]>: host gmail-smtp-in.l.google.com[2607:f8b0:4023:1407::1b]
said: 550-5.7.1 [2607:5300:60:47d6::      19] Our system has detected that
this 550-5.7.1 message is likely suspicious due to the very low reputation
of the 550-5.7.1 sending domain. To best protect our users from spam, the
message has 550-5.7.1 been blocked. Please visit 550 5.7.1
https://support.google.com/mail/answer/188131 for more information.
e10si145705ilc.155 - gsmtp (in reply to end of DATA command)

Thanks

0 + 1

smtp

gmail

Michael Hampton

12/12/22, 12:54 AM

Did you set a reverse DNS record for your IPv6 address?

The MW

1/24/23, 10:06 PM

Yes I have reverse DNS configured.

Elon Musk

I sit in a Tesla and translated this thread with Ai:

EN: Gmail reject emails sent from my domain: due to the very low reputation

TH: Gmail ปฏิเสธอีเมลที่ส่งจากโดเมนของฉัน: เนื่องจากชื่อเสียงต่ำมาก

RO: Gmail respinge e-mailurile trimise de pe domeniul meu: din cauza reputației foarte scăzute

RU: Gmail отклоняет электронные письма, отправленные с моего домена: из-за очень низкой репутации

VI: Gmail từ chối email được gửi từ miền của tôi: do mức độ uy tín rất thấp

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