Hi, using Exchange 365 and GMAIL is bouncing all emails -- unsolicited email from your IP address

Anonymous
2023-09-09T15:18:02+00:00

I did all the domain checks and everything is checking out fine. SPF and reverse DNS are all correct.

"Remote server returned '550 5.4.300 Message expired -> 421 4.7.28 [2a01:111:f403:7052::701 15] Our system has detected an unusual;rate of unsolicited mail originating from your IP address. To;protect our users from spam, mail sent from your IP address has been;temporarily rate limited. Please visit; https://support.google.com/mail/?p=UnsolicitedRateLimitError to"

Is there a problem on the MS IP addresses right now?

Microsoft 365 and Office | Subscription, account, billing | For business | Other

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  1. Anonymous
    2023-09-18T17:13:14+00:00

    I am unaware of steps to fix it.

    It's not a Comcast or Outlook issue. It appears to be a global issue with Gmail blocking/flagging Microsoft IPs.

    I just asked one of my users to ask her Gmail recipients to whitelist her email address, obviously, this is a ridiculous

    ask and not a fix, but curious if it works as a temporary fix.

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  2. Anonymous
    2023-09-18T17:00:15+00:00

    This is happening to us too. What can I do to fix this? Is there another thread that goes into the steps to correct this? Do I need to contact my ISP (Comcast)? Do I need to update some Outlook functions to prevent this issue?

    Thank you, Bill

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  3. Anonymous
    2023-09-18T12:15:37+00:00

    We're having the same issues with our clients too, but mostly only when they are emailing several Gmail addresses at once, for example, via a distribution group. Single emails to Gmail are going through.

    Let's hope Microsoft and Gmail are talking to each other to fix this, as it's way beyond us mere mortals...!

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  4. Anonymous
    2023-09-18T02:16:48+00:00

    Same issue here, this started happening in the past week or so.

    Can Microsoft please get their IPs off of Gmails blacklist?

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  5. Anonymous
    2023-09-17T21:44:37+00:00

    I'm getting the same problem with 2 of my customers. We are in New Zealand. It started showing up on sep 13th for both users with a connection dropped due to socketerror, now it is the same error as the original poster.

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