mail.protection.outlook.com connection refused SMTP port 25

Hello jobemma!

Welcome to Microsoft Office Community Forum. Thank you for sharing your concern with us today and we hope that all is well.

We do understand your concern that you are having issues sending emails. Let’s us check on this together and sort this out. Rest assured, we will do anything in our capability to assist you with your concern.

For us to better isolate this issue, we would like to ask a few questions;

1. What specific email address you are having issues sending email?

2. Is this a new email address that you have?

3. Is this a personal email address or work/company email address?

4. How to you send or receive emails? Are you using the Outlook mail application, a Web browser or other mail clients?

5. Can you please tell us the version of license you have on Microsoft? Please follow this guide here About Office: What version of Office am I using? (microsoft.com)

To answer your questions:

• What's the proper process for delisting? - In order for you to delist you email, you can access this link here. Delist IP - Delist IP (office.com)

• How to obtain a better reputation score so that my personal email to others aren't auto flagged as Spam? - In order for you to have a better reputation you may need to verify your account using this link here https://account.live.com/reputationcheck. Also you can check this article here from our threads to give a more information in improving your reputation score for your email. Improving Reputation. Problems sending group Emails. - Microsoft Community.

For more information, you also check this article here. Email non-delivery reports in Exchange Online | Microsoft Docs

We look forward to your response.

Sincerely,

ReynaldoB

Consumer M365 Forum Moderator

Microsoft Community

Hello moderator

I appreciate your assistance Here are my numbered answers

1). As a moderator, you might be able to review my profile.. You can find the email address there.

2). I've been the registered owner of this domain name since 2007, it is not new.

3). Business is certainly conducted using this email address and domain name.

4). Email is sent and received using a postfix mail server

5). I have an Office 365 subscription

Thank you for the Delist link. I did complete the delisting request. The public IP address on my mail server was validated by running

`curl -s https://icanhazip.com` AND `wget -O - -q https://checkip.amazonaws.com` from the linux mail server CLI

It has been two hours and I continue to receive connection timeouts

toor@mail:/var/log# telnet enphaseenergy-com.mail.protection.outlook.com 25

Trying 104.47.56.110...

telnet: Unable to connect to remote host: Connection timed out

AND

toor@mail:/var/log# telnet outlook.com 25

Trying 40.97.128.194...

telnet: Unable to connect to remote host: Connection timed out

And from the postfix mail server logs

Sep 4 00:15:55 mail postfix/smtp[13948]: 4H0hmX0Z58z1LCsm: to=<*** Email address is removed for privacy ***>, relay=none, delay=139135, delays=139075/0.02/60/0, dsn=4.4.1, status=deferred (connect to enphaseenergy-com.mail.protection.outlook.com[104.47.57.110]:25: Connection timed out)

I cannot load this resource, https://account.live.com/reputationcheck.  I receive a 404 Not Found Server Error

Server Error in '/' Application.

The resource cannot be found.Description: HTTP 404. The resource you are looking for (or one of its dependencies) could have been removed, had its name changed, or is temporarily unavailable.  Please review the following URL and make sure that it is spelled correctly.

Requested URL: /reputationcheck.

The second resource, https://answers.microsoft.com/en-us/outlook_com/forum/all/improving-reputation-problems-sending-group-emails/545258cb-99c3-481c-ba11-3e38302758b9 

is talking about emails sent from the outlook.com products. It does not relate to public internet email being sent to outlook.com products.

Hi jobemma!

Thank you so much for your reply.

My bad with the link on reputation check, there's a period at the end that is why it has an error opening the link. Here is the correct link: https://account.live.com/reputationcheck

And with you Office license, you mentioned you have Office 365, can you please specify if this is the Microsoft 365 Family/Personal or for the business license?

I've also checked your email and was able to see it, may I ask have you tried contacting your email service provider regarding the issue? You may need to contact you ESP to check if there's no issues from your server.

Sincerely,

ReynaldoB

Consumer M365 Forum Moderator

Microsoft Community

Hello moderator

Now when I visit https://account.live.com/reputationcheck, all I receive a a page to update my account information. I cannot actually get to /reputationcheck

I have a Microsoft 356 business license

I am my own email service provider. I can send email to all my contacts except for those at outllook.com The log server failure logs are already posted to a previous comment in this thread. I'm been administer of email servers since 1996.

What else can we check?

Hi jobemma!

I see, thank you for confirming that you have a Microsoft 365 business license. As our forum mainly focuses on the Office Consumer products, to make sure that you can get a more professional help, we will move this thread category to Microsoft 365 Apps for Business where you can get more professional help related to your issue.

Hope this helps and it is still best to connect with the correct team where you can get dedicated assistance, the experts there will further investigate it and provide accurate answers for you.

We highly appreciate your cooperation and understanding! We thank you for your time and participation in the community! Have a good day!

Sincerely,

ReynaldoB

Consumer M365 Forum Moderator

Microsoft Community

Hello moderator

Let's clarify this license. I use Microsoft 365 Apps for Business through my employer. I did not obtain a Home Use license.

While I do have use of a business license, this network blocking issue is globally across the Microsoft ecosystem.

You have asked for additional information from the mail server. Here is a returned email notification sent to the my user account that could not send to a user on the Microsoft virtual ecosystem. I can successfully send mail to users a gmail.com and yahoo.com to name a few.

I am still blocked. As subscribers to Microsoft services do the administrators of enphaseenergy.com have the ability to configure blocking rules for the domains they manage?

-------------------Blocked email notification --------------------------------------------

This is the mail system at host mail.DOMAIN.COM.

I'm sorry to have to inform you that your message could not
be delivered to one or more recipients. It's attached below.

For further assistance, please send mail to postmaster.

If you do so, please include this problem report. You can
delete your own text from the attached returned message.

                   The mail system

<*** Email address is removed for privacy ***>: connect to
    enphaseenergy-com.mail.protection.outlook.com[104.47.51.110]:25: Connection
    timed out

Close this issue. Even though my ISP said they unblocked TCP 25 outbound, they really didn't. It is now unblocked and all is well. Thank you for your support. I apologize as this was actually on me.