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
    2023-09-21T13:02:06+00:00

    It's 9/21/23 and still a problem! exactly as described in this thread. Only from Outlook desktop (not from outlook on web browser) that GMAIL returns messages when sending to more than one GMAIL user. This is the message I'm getting:

    Remote server returned '550 5.4.300 Message expired -> 421 4.7.28 [2a01:111:f400:7e89::62e 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;review our Bulk Email Senders Guidelines. q26-20020a170906b29a00b009a168973e11si11988954ejz.574 - gsmtp'

    I have a work account through Microsoft365 (purchased and managed through Microsoft); accessed through Outlook Desktop: Microsoft® Outlook® for Microsoft 365 MSO (Version 2309 Build 16.0.16827.20014) 64-bit and its only GMAIL that is rejecting my messages sent.

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  2. Anonymous
    2023-09-21T13:03:31+00:00

    Agree! I think it is totally a Microsoft issue -- why would you only have a problem on certain versions of Outlook?

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  3. Anonymous
    2023-09-21T13:10:42+00:00

    9/21 still having this issue.

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  4. Anonymous
    2023-09-21T15:22:43+00:00

    Same issue here. Works to individual gmail accounts but bounces back when there is 2 or. Microsoft need to provide a solution whether that is speaking with gmail or adapting the outgoing emails so they do not appear as SPAM.

    Microsoft - this is urgent and costing my business. Please resolve without delay.

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  5. Anonymous
    2023-09-21T15:36:33+00:00

    I have EXACTLT the same issue. Exchange 365 sending to GMAIL. Only GMAIL kicks them when I send more than 1 gmail address per message

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