ActiveSync issue exchange 2016 on-prem

AHMAD HASSAN 256 Reputation points

Hello all,

I have 3 problem hope support me to resolve it.

1- Can't add new email on some mobile devices "iPhone and Android" after add email, password, server and domain showing error "unable to support"

NB.: Not for all users also not for new email, sometime old email log out and can't login again

App used on mobile: Outlook
Connection: ActiveSync
Exchange 2016 CU 18

2- I set the users limit for "Maximum recipients" 15 person from PS, to all users but if I need set Maximum 15 person for each new user by default, I can't found how make it.

3- Have shared mailbox the user in shared mailbox have (Full Access and Send As) but can't send to more than 15 recipients, knowing I check (mailbox features ---> Mail Flow ---> Recipient limit) is unlimited.

Thanks for your support

Exchange Server Management
Exchange Server Management
Exchange Server: A family of Microsoft client/server messaging and collaboration software.Management: The act or process of organizing, handling, directing or controlling something.
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Accepted answer
  1. Kael Yao-MSFT 37,571 Reputation points Microsoft Vendor


    Please note: Generally, we suggest asking only one question in one thread unless the questions are related.
    It is suggested to create multiple threads for each of your questions to get better answers.It would also be beneficial to other community members.
    Thanks for your understanding.

    To Question 1:
    Do the affected users have multiple devices syncing with the Exchange server?
    Please locate EAC>Recipients > Mailboxes>Phone and Voice Features>View details and have a check.
    And can you find some activesync related events generated in the event viewer>application log?
    Here is also a microsoft KB on this topic for your reference: Unable to connect using Exchange ActiveSync due to Exchange resource consumption

    To Question 2:
    To my knowledge, you can't configure the default settings for newly created mailbox and may need to run the command "set-mailbox -recipientlimits" each time a new mailbox is created on Exchange on-premises.
    While if you are using Exchange online, you may use the command "Get-MailboxPlan | Set-MailboxPlan -RecipientLimits 50" to configure the default settings for new mailboxes.

    To Question 3:
    I suppose that you mean the shared mailbox doesn't have a recipient limit configured (default:unlimited).
    I tested in my lab (Exchange 2016 CU15 & Outlook 2016) but wasn't able to reproduce the problem.
    In which mailbox did you receive the NDR message? In the user's mailbox or in the shared mailbox?

    If the response is helpful, please click "Accept Answer" and upvote it.
    Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.

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