Answered by:
Problems sending emails to microsoft

Question
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Hello,
I use Mailgun to send messages from my app to emails from my clients.
It turns out that all of my clients' email addresses receive the messages except Outlook email addresses (Hotmail and Live).
The message I get is as follows: Server response: 550 5.7.1 Unfortunately, messages from [104.130.96.8] didn't sent. Please contact your Internet service provider since part of their network is on our block list (S3140).
The problem is that our IP is listed on SORB and only on it. Is this reason enough to refuse ALL emails sent to you?
We have already reviewed the texts we use for submission and are using best practices.
Mailgun cannot remove the IP from the SORBs list and this is preventing my clients from receiving important notices from my application.
Can you help me?- Moved by Richard MuellerMVP Monday, October 28, 2019 12:26 PM Not a TechNet Wiki question
Monday, October 28, 2019 11:42 AM
Answers
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This forum is for questions and discussions about the TechNet Wiki.
I don't see any forums for Mailgun, but perhaps you can use the feedback link at the bottom of this page:
https://www.mailgun.com/email-validation/
Or you can ask here about email:
https://answers.microsoft.com/en-us/outlook_com/forum/oemail
or about IP addresses here:
https://social.technet.microsoft.com/Forums/en-us/home?forum=winserveripamdhcpdns
Richard Mueller - MVP Enterprise Mobility (Identity and Access)
- Proposed as answer by Dave PatrickMVP Monday, October 28, 2019 12:44 PM
- Marked as answer by Richard MuellerMVP Tuesday, November 5, 2019 4:06 PM
Monday, October 28, 2019 12:20 PM -
also try delisting here.
Regards, Dave Patrick ....
Microsoft Certified Professional
Microsoft MVP [Windows Server] Datacenter Management
Disclaimer: This posting is provided "AS IS" with no warranties or guarantees, and confers no rights.- Marked as answer by Richard MuellerMVP Tuesday, November 5, 2019 4:06 PM
Monday, October 28, 2019 12:44 PM
All replies
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This forum is for questions and discussions about the TechNet Wiki.
I don't see any forums for Mailgun, but perhaps you can use the feedback link at the bottom of this page:
https://www.mailgun.com/email-validation/
Or you can ask here about email:
https://answers.microsoft.com/en-us/outlook_com/forum/oemail
or about IP addresses here:
https://social.technet.microsoft.com/Forums/en-us/home?forum=winserveripamdhcpdns
Richard Mueller - MVP Enterprise Mobility (Identity and Access)
- Proposed as answer by Dave PatrickMVP Monday, October 28, 2019 12:44 PM
- Marked as answer by Richard MuellerMVP Tuesday, November 5, 2019 4:06 PM
Monday, October 28, 2019 12:20 PM -
also try delisting here.
Regards, Dave Patrick ....
Microsoft Certified Professional
Microsoft MVP [Windows Server] Datacenter Management
Disclaimer: This posting is provided "AS IS" with no warranties or guarantees, and confers no rights.- Marked as answer by Richard MuellerMVP Tuesday, November 5, 2019 4:06 PM
Monday, October 28, 2019 12:44 PM -
Thank you.Tuesday, October 29, 2019 3:10 PM
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Thank you.Tuesday, October 29, 2019 3:10 PM
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Thank you.Tuesday, October 29, 2019 3:11 PM
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You're welcome.
Regards, Dave Patrick ....
Microsoft Certified Professional
Microsoft MVP [Windows Server] Datacenter Management
Disclaimer: This posting is provided "AS IS" with no warranties or guarantees, and confers no rights.Tuesday, October 29, 2019 3:13 PM