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How to improve my Domain reputation?
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two weeks ago, my mail server(not G suite) was attacked by  'Back against' and than domain reputation became to 'low' than Gmail put our mail into spam.

I sure that my mail server can compliant 'Sender Guidelines'. 
'
Can gmail give  effective solution or channel to improve my domain reputation?

I am almost mad for the problem.

BTW, after the attacking, other mail venders also put my mails into spam, but they provide a proper channel, and now, I have solved the problem from other mail venders.  The gmail is the last one and also only one, I do not know what I can do for the problem.

BRs,
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Same issue, I fixed my server, change IP and improve security with DMARC, DKIM and after that send report ticket to Google but not any respond :(
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Same here, trying to communicate with Google but no succes yet.
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I had the same issue. 1 hour compromise which got fixed immediately, but apparently permanents downgrade of domain reputation with google. I have a low volume private mail domain, which got noted by google only during the compromise, so there is little chance of getting better rating in the future.

And google does not provide any communication channel
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I think google have to provide a way for Email Administrator to improve the domain reputation. 
If pass reputation most of the time is high, should shorter the period of bad reputation.
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We changed the server IP adress on febr. 11, but still low reputation. We cant send email to gmail adress. How long does this madness last?
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