Microsoft Outlook For Mac 2016 To Many Services Erro

Microsoft Outlook For Mac 2016 To Many Services Erro

One of my users has exactly the same issue and it happens once or twice a day. When Outlook is restarted it is resolved usually. Notes: She is using one of the most recent versions of Outlook for Mac 2016 (16.9 or higher) She is running macOS Sierra 10.12.6; She is thus far the only person in our organization experiencing this. You can also use the following procedure to determine this value without checking the registry on your Exchange server. If the value that's shown in MFCMAPI differs from the value that's shown in the registry on the Exchange server, either you are not on the correct Exchange server or the registry value is not being used yet (because the Exchange Information Store service has not been restarted).

Chandra Bhushan Modified: June 15th, 2018 Outlook

Since yesterday night, I am trying to receive an email on my Outlook for Mac email app. I am using this program for 4 to 5 years but, had never experienced such type of situation. Don’t know what has happened to my Mac laptop!! Well, whenever I try to get an email it shows an error statement i.e., connection to the server failed or dropped, with the Microsoft Outlook Mac error code 17895. Now the current status is that neither I am able to send an email from Outlook 2011 nor am able to receive it. Is there any technician who can help me out with this issue?

The Mac Outlook 2011 / 2016 error 17895 occurs when a Mac user tries to send or receive an email from Outlook. This kind of scenario interrupts the ongoing work of an Outlook 2011 / 2016 for Mac users. This guide who will be telling you about this problem and illustrate the workarounds to fix it.

What is Outlook Mac Error Code 17895?

This error code represents that your network connection of the laptop is troubling from the server authentication problems. A proper connection is unable to get established to exchange emails in the respective mail client. Following enlisted are few symptoms of Microsoft Outlook for Mac error 17895:

  • Low performance of Mac operating system
  • Slow response of Outlook 2011 / 2016
  • Your PC is getting stopped and frozen
  • BSoD (Blue Screen of Death) error

Possible Causes of Outlook Mac Error Code 17895

There are some causes responsible for the occurrence of system or application error. Similarly, the causes for Mac Outlook 2011 / 2016 error 17895 are highlighted below:

  • Presence of corruption in OLM database files
  • Sudden shutdown or restart of Apple PC
  • Improper app installation or uninstallation
  • Misconfiguration in Mac operating system

Workarounds to Fix Outlook Mac Error Code 17895

Solution #1: Change the Server Settings

  • Open the start menu on your PC and click on the Search box.
  • Type Tools setting in the search box and press Enter key.
  • In the list of tools, choose the account in which error is taking place.
  • Open settings of this respective account and go to Outgoing Server box field.
  • Enable the checkbox of Override default port and mention 587 port number.
  • Click on the OK button to update all the made server settings.
  • Verify that your SSL box is connected and then, restart the machine.

Microsoft Outlook For Mac 2016 To Many Services Error

Solution #2: Reset the Account Settings

If you had made any changes in your account settings, reset them. For this, you can refer following settings:

Microsoft Outlook For Mac 2016 To Many Services Errors

  • Navigate towards Outlook 2011 / 2016 and click on the Open button.
  • Go to the Settings icon and click on it.
  • Move towards the account’s general button settings and click Open.
  • Now click on the Reset button and follow up the screen instructions.
  • After all this, restart your machine and check whether Microsoft Outlook for Mac error code 17895 is resolved or not.

Solution #3: Change the BSoD Settings

  • Open start menu on your PC and look for Finder app
  • Click on Finder and let it get opened
  • In the search box, type BSoD and press Enter key
  • Now open the setting wizard of BSoD and click on General button
  • This will open a taskbar where you have to click on the Reset button
  • Follow the entire command for accessing to the prompt
  • At last, click on the Finish button and restart your Mac machine

Final Thoughts

The workarounds illustrated in this blog to resolve Outlook Mac error code 17895 are workable on Outlook for Mac 2011 and 2016. Even if the measures are unable to fix your problem then, contact to the Internet Service provider. It is so because the only cause left behind the error is a misconfiguration in the server settings.


Assume that Microsoft Outlook 2016 for Mac performs an Autodiscover operation. For example, Outlook performs an Autodiscover operation during Outlook start or periodically while Outlook runs. In this scenario, you may receive a warning message that resembles the following:

A secure connection cannot be established with the server <> because its intermediate or root certificate cannot be found. Do you want to continue?
If you continue, the information that you view and send will be encrypted, but will not be secure.


When you receive this warning message, you can click Continue to accept the warning. However, the warning may reappear the next time that Autodiscover runs.


Microsoft Outlook For Mac 2016 To Many Services Erro

This issue occurs in Outlook 2016 for Mac version 15.9 and later versions when Outlook performs an Autodiscover operation and tries to connect to a service endpoint whose expected name is not present on the server's Secure Sockets Layer (SSL) certificate.


To resolve this issue, use one of the following methods:

Method 1

Reissue a certificate that includes the domain name as the Subject Alternative Name. This enables you to resolve the issue for all Outlook for Mac clients without having to trust the certificate from each client individually.

Method 2

Trust the certificate on the Mac client. This solution enables you to resolve the issue quickly for individual Mac clients without having to reissue the certificate.

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  1. When you receive the certificate warning message, click Show Certificate.

  2. Select the Always trust <> when connecting to <> check box, and then click Continue.

More Information

As an example, consider the domain This domain has an SSL certificate configured for the domain When Outlook 2016 for Mac performs Autodiscover, it uses the domain name part of the user's SMTP address to query DNS. In this example, it tries to connect the URL, and it expects the certificate for the top-level domain However, Outlook receives the certificate that is named The certificate name mismatch causes Outlook to present the warning that is mentioned in the 'Symptoms' section.
When you view the details of the certificate by clicking Show Certificate, you see a warning message in the certificate details that states the following:

This certificate is not valid (host name mismatch)

If you receive a certificate warning that resembles this warning but does not contain the phrase 'host name mismatch,' method 1 in the 'Resolution' section may not resolve the issue.
For more information about how the Autodiscover service works with Outlook for Mac, see the following Microsoft TechNet article: