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NDR - DigitalOcean IPs blocked by Office365 SMTP server.

Anonymous
2018-04-21T19:29:18+00:00

Hello, I'm trying to send a confirmation email every time a user registers in my web application. However in my dev machine (Vodafone ISP not DigitalOcean) everything is ok. I can successfully send emails to other domains (gmail, hotmail, etc)... 

The problem is in the production server. It seems that somehow my email are being blocked. (I can only send to myself)

This is the failure message received:

code: 'EMESSAGE',

response: '550 5.7.708 Service unavailable. Access denied, traffic not accepted from this IP. For more information please go to http://go.microsoft.com/fwlink/?LinkId=526653 AS(8561) [LNXP265MB0234.GBRP265.PROD.OUTLOOK.COM]', responseCode: 550,

Do you know what's wrong? The Office365 account is provided through GoDaddy.

Best regards,

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

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  1. Anonymous
    2018-05-08T15:10:38+00:00

    Hello Artur,

    Thanks for your post here.

    Since the cause may be different, we encourage you post a new thread with the detailed information for the best assistance.

    We would highly appreciate your understanding and time.

    Regards,

    Rudy

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  2. Anonymous
    2018-05-06T19:29:11+00:00

    Hello John,

    Adding IPv4 didn't help.

    Adding IPv6 gives me error message: "2001:xxx:xxx::/64" is not allowed. The ability to add IPv6 ranges is not supported.

    Any ideas why paid users cannot send emails? :>

    Subscription bought directly from Microsoft,

    Best,

    Artur

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  3. Anonymous
    2018-04-21T20:48:12+00:00

    Hello John,

    Generally, when we find the IP address of our Office 365 for Business account is blocked by the Exchange Online Protection (EOP), there is a way to check and delist it from the block list. Please see: Removing a user, domain, or IP address from a block list after sending spam email.

    Meanwhile, for protecting your Office 365 account, we also can add IP address to IP Allow list to prevent the block: in Exchange Admin center > protection > connection filtering > click Add button under IP Allow list. Please see:

    Please check the above information on your side.

    If issue persists, we suggest you contact with the GoDaddy support for further help. Since this issue may be related to the server side and your Office 365 account is purchased from GoDaddy as you mentioned above.

    Your time and understanding are appreciated.

    Regards,

    Rudy

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