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Mystery Emails for Meeting
Hello I have this weird issue that I have been tracking down. A user's mailbox sends emails out every night as reminders to an appointment that they setup. The email goes to all participants in the meeting, regardless of whether they accepted or not. I used message trace to track the source IP and it trusted, none network within my management, which wouldn't have devices unaccounted for. I am not concerned that it is malicious or an account takeover situation, since there isn't any content added to the meeting. It is the same email every morning this week. Is there a cause for this? Are there any options in Exchange or outlook that this could be attributed to? For example one that would effectively say "keep reminding participants of this"? A few other details, which may or may not be relevant: On at least one occasion, I verified that their computer was turned off. So, it is either their iPad or there iPhone, but I am not sure if that is relevant. I have this posted to an apple forum as well. Of the 6 participants that the message goes to (according to exchange message trace) only 1 actually says that it shows up in his mailbox. Which makes me think that the other mailboxes are simply processing the redundant meeting message and there is something special about this one. But, I don't want to focus on that because it is too dependent on user input. It's really a question of why the messages are being sent in the first place. Thanks! This is a weekly recurring meeting and these mystery emails are going out daily.SolveddirtadminAug 29, 2025Copper Contributor57Views0likes1Comment
Request for Official Cleanup Script to Retire Exchange 2016 After Migrating to Exchange SE
Subject: Request for Official Cleanup Script to Retire Exchange 2016 After Migrating to Exchange SE Hi Exchange Team, I've successfully migrated mail flow and management to Exchange Server Subscription Edition (SE) and am now preparing to retire our legacy Exchange 2016 server (EXCHANGE2016). I’ve followed the documented steps from the Decommissioning Exchange Server 2016 blog post, but I recall that a script—Cleanup-ExchangeLegacyServer.ps1—was referenced or released separately to automate the final cleanup. I’m unable to locate the actual script and would appreciate guidance on where to find it. Here’s a summary of what I’ve completed so far: Steps Completed Mail Flow Migration Reconfigured send connectors: Set-SendConnector "Outbound to Office 365" -SourceTransportServers @("EXCHANGESE") Verified SmartHost routing and TLS settings. Receive Connector Cleanup Disabled all receive connectors on EXCHANGE2016: Get-ReceiveConnector -Server EXCHANGE2016 | Disable-ReceiveConnector Mailbox Migration Moved all user, arbitration, audit log, and monitoring mailboxes: Get-Mailbox -Server EXCHANGE2016 Get-Mailbox -Server EXCHANGE2016 -Arbitration Get-Mailbox -Server EXCHANGE2016 -AuditLog Get-Mailbox -Server EXCHANGE2016 -Monitoring Queue Validation Confirmed no active queues on EXCHANGE2016. Connector Scope Audit Verified EXCHANGE2016 is no longer listed in any send connector: Get-SendConnector | Where-Object {$_.SourceTransportServers -contains "EXCHANGE2016"} Remaining Question Should I now: Run an official cleanup script (e.g., Cleanup-ExchangeLegacyServer.ps1) to safely remove EXCHANGE2016’s configuration objects while keeping Exchange SE intact? Or simply uninstall Exchange 2016 from EXCHANGE2016 and decommission the server manually? I want to ensure I follow Microsoft’s best practices and avoid breaking hybrid management or leaving orphaned AD objects. If the script is available, could you please share the official download link and any updated guidance? Thanks in advance for your help! —MichaelSolvedmrlovettAug 28, 2025Copper Contributor73Views0likes2Comments
Assistance with Database Transaction log relocation
Dear Exchange Community, Recently, I have been tasked to relocate the Database log files and folders to another partition. to elaborate further, I have 2 mailbox servers with DAG configured and 4 Databases. As everyone is aware, one partition for databases and one dedicated for DBs logs (On both servers). I would like to know how can I do this, What are the requirements? and what precautionary measures should I take in order to minimize the failure or even database corruption. Any help regarding this matter would be appreciated a lot ThanksSolvedHamedNourollahAug 20, 2025Copper Contributor80Views3likes5CommentsO365 hybrid connector to onprem failing TLS
We're having issue with the connector to on-prem from Exchange Online If we enable the TLS it fails with the error Cannot connect to remote server [Message=451 5.7.3 STARTTLS is required to send mail Looking at the on-prem server we noticed that if connecting to port 25 STARTLS is missing but connecting to port 587 is present PORT 587 250-SIZE 20971520 250-PIPELINING 250-DSN 250-ENHANCEDSTATUSCODES 250-STARTTLS 250-AUTH NTLM 250-8BITMIME 250-BINARYMIME 250 CHUNKING 451 4.7.0 Timeout waiting for client input PORT 25 250-SIZE 62423040 250-PIPELINING 250-DSN 250-ENHANCEDSTATUSCODES 250-8BITMIME 250-BINARYMIME 250 CHUNKING 451 4.7.0 Timeout waiting for client input Is there a way to have it enabled on port 25 as well ?SolvedStefanoC66Aug 19, 2025Iron Contributor158Views0likes7Comments
Exchange 2016 Maximum number of recipients in a message that's sent by the specific sender
Hello, I want to know if the RecipientLimits value on a mailbox can override the MaxRecipientEnvelopeLimit. For example, if I set the MaxRecipientEnvelopeLimit to 50 to limit all organization mailboxes to a maximum of 50 recipients, and then I set the RecipientLimits of a specific mailbox, let’s say user10@mylab.local, to unlimited. Can user10 send an email with 100 recipients or not?SolvedMasPAN74Aug 18, 2025Brass Contributor82Views2likes6Comments
Discrepancy with shared mailbox when removing user-mailbox
Hello, When we remove a mailbox from Exchange 365, we see a discrepancy with the shared mailboxes the user had access/permissions for. - the user-object is deleted for "Full-Access" - the user-object is not deleted for "Send As". Because the user/mailbox does not exist anymore, now the SSID (S-1-5-21-.......) is displayed instead of the users mailaddress. Why isn't 'Send As' cleaned up; 'Full-Access' is? Now we have several old permissions on the shared mailboxes. Kind regards, ArjanSolvedArjanBroekhuizenAug 14, 2025Iron Contributor85Views1like4Comments
Centralized mail transport and sending outgoing messages directly from EXO
Dear Community I have a following question: my company is using Exchange hybrid environment, with centralized mail transport. Both incoming and outgoing messages are routed through on-prem mail gateway, also MX points to it. We would like to deprecate the on-prem gateway soon and the first step might be changing routing for outbound emails, so they go directly from EXO to gmail.com for example. And here is the real concern - is there any tricky way, to set this routing selectively, for a pilot user group first, before we change it globally? I know about Set-OutboundConnector and RouteAllMessagesViaOnPremises parameter, but I wouldn't like to change it before doing some test on selected mailboxes. Will be happy for any suggestion. Best Regards MarcinSolvedMarcin K.Aug 11, 2025Brass Contributor166Views0likes7Comments
Exchange hybrid removal – partial
I have full hybrid configured. I have no mailboxes on prem. I use Exchange as mail relay (auth and non auth SMTP). With on extra information. One of SMTP domains is configured as internal relay. So, emails address to unknown recipients is routed to exchange on premise, that I use Target address SMTP:*.mail.onmicrosoft.com on existing object to rout email to valid O365 mailbox. I was looking in to this article : https://jaapwesselius.com/2020/12/15/remove-exchange-hybrid-configuration/#:~:text=Disable%20OAuth%20on%2Dpremises,on%2Dpremises%20and%20Exchange%20Online.&text=These%20are%20the%20steps%20needed,option%20in%20Azure%20AD%20Connect. Remove certificates : I will run command .\ConfigureExchangeHybridApplication.ps1 -ResetFirstPartyServicePrincipalKeyCredentials This will brake Free/Busy, MailTips, and Photos. Disable Oath: On Prem and in Cloud. Get-intraOrganizationConnector | Set-IntraOrganizationConnector -Enabled $False SMTP Routing I will not run Remove-HybridConfiguration, i dont see mail issue if setting is left in AD. And i don’t need to recreate connectors. Should I run Remove-IntraOrganizationConnector on premise that include domain domain.mail.onmicrosoft.com which i use for routing, and same on O365, which include all registered domains. I believe I can. Should I left both connector intact in on prem and in O365. I have created Dedicated send connector : AddressSpaces : {smtp:*;1} SmartHosts : {********.mail.protection.outlook.com} CloudServicesMailEnabled : True Fqdn, TlsCertificateName, RequireTLS … True I also have the following connector : Outbound to Office 365 - ******-********-******* TlsDomain : mail.protection.outlook.com AddressSpaces : {smtp:********.mail.onmicrosoft.com;1} The default receive connector is configured to accept mail from O365. The firewall allows only mail originating from Exchange Online IP addresses. Existing receive and send connector configurations established by the hybrid setup will be maintained. Remove-OrganizationRelationship : I already run this command on premise and O365. SCP and AutoDiscover : Public CNAM record all points to O365 autodiscover.outlook.com Internal entries remain, and I have many domains to update. If I run the commands now, will they immediately disrupt on-premises Autodiscover, or continue working as usual? Can I gradually set up CNAME records and finally set AutoDiscoverServiceInternalUri to $null?SolvedMali_StaneAug 11, 2025Copper Contributor74Views0likes2Comments
CVE-2025-53786 - Anyone knows what to do?
Good day, there is the CVE-2025-53786 and even there is a lot of articles around about the security leak, it's not clear what to do exactly. A hotfix seems to be available for Exchange 2016 and 2019: Released: April 2025 Exchange Server Hotfix Updates | Microsoft Community Hub According to MS, https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-53786, Exchange SE is affected. The Hotfix mentioned above does not apply to Exchange SE so whats the solution? KB5047155 is the very first version of Exchange SE. So can Exchange SE be affected and be the solution at the same time? I dont think so. Can someone please tell what exactly to do on an Exchange SE server to close the leak? Best RegardsSolvedhauer94Aug 08, 2025Copper Contributor751Views0likes1CommentRequest on Exchange Server SE CU1 Codebase and Trial Version Behavior
Dear Microsoft Exchange Team and Community, I have questions about Exchange Server Subscription Edition (SE): Codebase of Exchange SE CU1 vs. Exchange 2019 CU15 The roadmap says Exchange SE RTM matches Exchange 2019 CU15 codebase, with new features starting in SE CU1. Is SE CU1 a standalone codebase or a direct continuation of Exchange 2019 CU15 with added features? Behavior after Exchange SE trial expiration What happens when the SE trial expires? Are all functions fully retained? Are any services or features restricted or disabled? Will the server remain usable? Thanks for your clarification!SolvedMahmood20Aug 01, 2025Copper Contributor257Views0likes4Comments
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