Problems with senderdomain

Question

Hi ,

Recently, I have used the ESP called Copernica to send batches of emails to a profile database. However, for many of the recipients we seem to be getting an error message. On top of which, the email does not seem to send. We are getting the following error message:

Recipient address rejected: Access denied. AS(201806281)

Base code: 550

Extended code: 5.4.1

According to copernica this seems to be caused by Outlook blocking our sender domain. Is this true, and how are we able to fix this?

Kind regards,

Oscar

Answer 1

Hi Cindy,

I have checked the DNS settings and they all seem to be correct.

What would be the next step in fixing this problem?

Kind regards,

Oscar

Answer 2

Hi,

My name is Cindy. I am sorry you are having this problem. I know it is really frustrating. I will do my best to help you with this problem.

Please note: This is a user-to-user community forum. We are users just like you who help others. We are not employees of Microsoft.

Here is a link that explains the possible problems. Since are using an outside vendor, one of the setting's DNS settings may not be correct or it can take up to 24-72 hours for the settings with the outside vender to take effect. These are the standard time frames when setting up the DNS settings. I have set up these settings many times over the years.

https://learn.microsoft.com/en-us/exchange/trou...

Please let me know if you have any questions.

Cindy

Note: This is a non-Microsoft website. The page appears to be providing accurate, safe information. Watch out for ads on the site that may advertise products frequently classified as a PUP (Potentially Unwanted Products). Thoroughly research any product advertised on the site before you decide to download and install it.

Answer 3

Thank you for your reply and information.

I am sorry that the processes followed earlier did not work and thank you for your cooperation. Unfortunately, I don't have any more troubleshooting to offer.

There are many experienced users active on the forum and I hope someone can offer more information about your issue.

Sincerely,

Victor S.

Answer 4

Hi Vitor,

Thanks for your response!

To further explain the problem, the DNS settings that we have now seem to be okay.

We sent out emails in a number of batches, of which around 20% seemed to bounce due to a number of different errors.

However, now all outlook adresses seem to reject our emails.

This is a probem of course because a large portion of our database consists of outlook users.

If the DNS settings all seem to be fine, what is the next step in trying to figure out how we can fix this problem?

Kind regards,

Oscar

Answer 5

Hey, how you doing?

Thank you for contacting us and welcome to the Microsoft Community.

My name is Vitor. I'm an Independent Advisor and I'll be glad to help you today.

Check this article below:

Fix NDR error "550 5.7.700" through "550 5.7.750" in Exchange Online.

https://learn.microsoft.com/en-us/exchange/trou...

Check if the suggestions above helped you and tell me if it worked.

Thanks,

Vitor S.