Exchange Hybrid connector validation from o365 to on-prem
We recently setup Exchange Hybrid on Classic mode. Completed without errors. During setup we ensure that the Transport Certificate is valid and we assigned our 3rd party cert. We checked on IIS that "Default Front End" certificates are assigned with 3rd party cert. IIS 'Exchange Back End' is using the private "Exchange Server" certificate. When checking Exchange online connectors and validating the O365-Onprem connector, it errors with "450 4.4.317 Cannot connect to remote server [Message=SubjectMismatch Expected Subject: ...... Thumbprint:######" When troubleshooting and Checking the certificate thumbprint from the error message on the server. Determined that the thumbprint belonged to the private certificate used in the 'Exchange Back End' Not sure why it's presenting the wrong certificate and not the front-end certificate? Normal email flow is still working. Appreciate anyone's feedback.
Internal mails get sent to primary smtp instead of alias
Hey there, in our company we have a service mailbox (user mailbox) with several aliases for different top level domains. Before they were all separate mail boxes with different mail rules, but for simplicity and management we merged they all on the main (.com) domain and combined the mail/forwarding rules. Now we have the issue that internal mails sent/forwarded to the alias domains, automatically get resolved and sent to the primary SMTP address and therefore the mail rules don't get triggered. Alias also won't show in the mail header. We have already deleted all offline address books(OAB), enforced the use of the GAL (via client and registry) and cleared all caches. Also, not all internal mail accounts are affected, since this usually happens with accounts which are in the delegation of the service mailbox (via security group) yet not all of them are affected. Any suggestions?
Exchange Hybrid - On-Prem mailboxes can't send to Online mailboxes
We're now running Exchange Hybrid OnPrem: Exchange 2019 latest patch. On-Prem mailboxes are not able to communicate with mailboxes in Exchange Online in any way. The other way around is working fie though. Mailboxes on-prem: The communication to Exchange Online mailboxes isn't working > Can't send emails to Exchange Online mailboxes, or see free busy of Exchange online mailboxes and can't send calendar invites. Mailboxes in Exchange Online: Receive emails from external sent to: email address removed for privacy reasons - working. Receive emails from external sent to: email address removed for privacy reasons - working. Receive emails form external setn to: email address removed for privacy reasons - NOT working. Receive emails from internal on-prem mailbox - NOT working. No matter to which domain it is sent. Calendars: Users can fully see on-prem calendars and can also send invites. Send emails to external and internal - working. The Exchange on-prem queue shows: DeliveryType: DnsConnectorDeliver Status: Retry NextHopDomain: cadomain.mail.onmicrosoft.com The bounce back emails the on-prem mailbox receives when trying to send to a mailbx that is online: Server at cadomain.mail.onmicrosoft.com (104.47.75.164) returned '400 4.4.7 Message delayed' 3/24/2023 3:38:01 AM - Server at cadomain.mail.onmicrosoft.com (104.47.75.164) returned '450 4.4.316 Connection refused [Message=Socket error code 10061] [LastAttemptedServerName=cadomain.mail.onmicrosoft.com] [LastAttemptedIP=104.47.75.164:25](Socket error code 10061)' This is the on-prem Exchange delivery report: Delivery Report for usernametest2 (usernametest2(at)domain.ca) Submitted3/24/2023 9:25 AM EXCHANGE2019 The message was submitted to on-premExchange.domain.local. Pending 3/24/2023 9:25 AM on-premExchange.domain.local Message was received by on-premExchange.domain.local from on-premExchange.domain.local. 3/24/2023 9:25 AM on-premExchange.domain.local The e-mail address for recipient "usernametest2(at)domain.ca" was updated to the e-mail address "usernametest2(at)cadomain.mail.onmicrosoft.com". The message is in the process of being delivered. Submitted 3/24/2023 9:27 AM on-premExchange.domain.local The message was submitted to on-premExchange.domain.local. Pending 3/24/2023 9:28 AM on-premExchange.domain.local The e-mail address for recipient "usernametest2(at)cadomain.mail.onmicrosoft.com" was updated to the e-mail address "usernametest2(at)domain.ca". The message is in the process of being delivered. 3/24/2023 10:40 AM on-premExchange.domain.local Message delivery is taking longer than expected. There may be system delays. For more information, contact your email admin.
Existing O365 Environment with AD and Introducing Azure AD Connect
I have an all cloud email environment in O365 but an on-premises Active Directory environment. We must introduce Azure AD Connect to get the two environment aligned. I know what I need to do to soft match the O365 accounts with the on-premise AD accounts. I also know I need at least an Exchange Management Tools server to management my users that will now be sourced on-premises. What I do not know is if I need to run the Hybrid Configuration Wizard. There is absolutely no mail currently on-premises and there never will be. Do I still need to run HCW in this situation? Thanks.
It cannot show items in office 365 groups which were migrated from onprem Exchange Public folder
Our another engineer migrated specific public folders in on-prem exchange to office 365 groups, then when it successfully migrated to office 365 groups, we can show items on office 365 groups in the outlook client and owa, but when we see items in mobile outlook (ex, Both Android and iOS) , it is hard to see items even if there are items, anyone know why it happens, and do you have any solution in that situation? Customer environment is Exchange 2016 Hybrid structure they are using.