When certificates needs to be renewed or changed on (on-premise) Exchange server’s, and you have Microsoft 365 hybrid setup though Hybrid Configuration Wizard, a Office 365 connecter is setup as send and receive: Receive: Default Frontend xxxx/EXCH01 Send: Outbound to Office 365 xxxxx send connector If you try to delete the old certificate, without setting the new cert for the connectors, you will get this in ECP: “A special Rpc error occurs on server EXCH01: These certificates are tagged with following Send Connectors : Outbound to Office 365. Removing and replacing certificates from Send Connector would break the mail flow. …
Categoria: Exchange
Configure Wildcard SSL Certificate for POP/IMAP on Exchange 2010 (PowerShell)
It is assumed you have your SSL wildcard certificate already installed on an Exchange 2010 server. We use Windows Server 2008 R2 Datacenter x64 in this example. Open Exchange Management Shell as Administrator and get a list of SSL certificates that are available: When you enable the wildcard *.example.com certificate for POP service, you normally get the following error: The same applies to IMAP: Set FQDN for POP service to fix the error: Do the same for IMAP service: Verify POP settings: Verify IMAP settings: Restart POP and IMAP services: Source link: https://www.lisenet.com/2014/configure-wildcard-ssl-certificate-for-pop-imap-on-exchange-2010-server/
PowerShell One-Liner: Get a Count of Exchange Server Mailboxes Per Database
Message size and recipient limits in Exchange Server
https://docs.microsoft.com/en-us/exchange/mail-flow/message-size-limits?view=exchserver-2019
Hide Office 365 Groups from the GAL
Schools may require that newly created classes are hidden from the Global Address List (GAL) in Exchange Online. Classes may be hidden through PowerShell. Use the instructions below to hide Classes created with SDS from the GAL. Classes are represented in Office 365 as Office 365 Groups. In Exchange Online, where the GAL is built, they are called Unified Groups. Use the Get/Set-UnifiedGroup cmdlet to manage these groups through PowerShell. Hide a single class Launch PowerShell as an Administrator and connect to Exchange Onlineas shown below. Once connected, run the command below against the Group you want to hide. …
Problems with mail flow after changing email certificate
Problems sending email from onpremises to Office 365 accounts in hybrid environment. When configuring a hybrid deployment, you must use and configure certificates that you have purchased from a trusted third-party CA. To check if the issue is related to the certificate part, please manually remove the previously created hybrid connectors both in the on-premises Exchange server and Office 365, re-run the HCW (Hybrid Configuration Wizard) to re-create these connectors using the new certificate, then check if the messages can be delivered.
Use the Exchange Management Shell to set up mail forwarding
This example delivers email to the mailbox of Douglas Kohn and, at the same time, forwards all mail sent to Douglas Kohn to douglaskohn.parents@fineartschool.net. This example forwards all email sent to the mailbox of Ken Sanchez, an employee of Contoso Suites, to one of his coworkers, pilarp@contoso.com. For detailed syntax and parameter information, see Set-Mailbox. Note: -ForwardingsmtpAddress to multiple addresses Shell script The parameter “ForwardingSmtpAddress” only allow to setup one SMTP address. To work around this issue, you can setup the mailbox forwarding to a distribution group, you need to add the users you want to forward message to this …
Email Forwarding on an on-prem mailbox to Office 365 mailbox
Configure email forwarding for a mailbox Set-Mailbox -Identity “OnPrem mailbox” -ForwardingSMTPAddress “Office 365 mailbox”
How to prevent internal email spoofing in an Exchange organization
Ensuring email security might be one of the most important and most difficult tasks an administrator must face. Every day, servers process thousands of emails and controlling such a big mail flow is not easy. No wonder hackers focus on this channel when they plan attacks. They use various tricks to make users think that opening a suspicious attachment is a good idea. One of the tricks they use is email spoofing. What is email spoofing? Email spoofing is a very popular attack method. The sender modifies message headers so that emails appear as sent from someone else. Hackers use …
MRS Proxy Error “The connection to the server could not be completed”
Check MRS endpoint user and password.