What is an X500 address?

Because Exchange auto-complete cache uses X. 500 addresses for e-mail sent to addresses within the Exchange organization, it will bounce back messages from a re-created mailbox even after you give the user account all the old SMTP addresses.

What is an X500?

The X500 email address, or the X500 Proxy Address, is one of the most important “tricks” of the data migration trade. Regardless of Exchange Version, including Exchange 2010, Exchange 2013, Exchange 2016, or Exchange Online in Office 365, this trick still applies today.

How is X500 address created?

The x500 addresses were generated based on the “mail” attribute of the AD object, since the mail contact and the regular AD account’s mail attribute are the same, no matter if we tried to delete this proxyaddress or modify it, it will always come back with the x500 address tied to this mail attribute.

How do I fix my X500 address?

To solve the issue, you need to add the X500 address in the user’s proxyAddresses attribute in the AD.

Open ADSI Edit and connect to “Default Naming Context”.
Select the user object, and right click it to open properties.
Add the X500 address to the proxyAddresses attribute.

Does Office 365 use X500 addresses?

Office 365 will sync the Exchange Online “LegacyExchangeDN” attribute to the on-premises as a X500 address. After the mailbox is migrated but the user still needs to deal with the old mail items generated in the old Exchange Server or with the mail contacts in the old Exchange Server.

Can I remove X500 address?

Hi, It’s correct, x500 addresses you mentioned represent old legacy Exchange DN values that are cached Email address in Outlook. If you remove them, replies and meeting updates could fail. It’s not recommended to remove them.

Can I remove x500 address?

What is a LegacyExchangeDN address?

The legacyExchangeDN value is set when a mailbox is created, and includes the name of the Exchange administrative group where the mailbox belongs. LegacyExchangeDN values typically look like this: /o=Organisation/ou=Administrative Group/cn= Recipients/cn=Username.

Can I delete X500 address?

What is a LegacyExchangeDN?

LegacyExchangeDN is an attribute of several Active Directory objects related to Exchange Server. LegacyExchangeDN serves to map objects to a naming system understood by Exchange Server 5.5 for backward compatibility.

How do I get X500 address from NDR?

To create an X500 proxy address for the old LegacyExchangeDN attribute for the user, make the following changes based on the recipient address in the NDR:

Replace any underscore character (_) with a slash character (/).
Replace “+20” with a blank space.
Replace “+28” with an opening parenthesis character.

What is SPO email address type?

The SPO initialism indicates the new address type is related to SharePoint Online features, the fact that it only appears on objects with a SharePoint Online license confirms this. At this time there’s no public documentation that describes the function of this new addresses.

What is the X500 email address?

What is the meaning of X500?

– Definition from Techopedia What Does X.500 Mean? What Does X.500 Mean? X.500 is a series of computer networking standards used to develop the equivalent of an electronic directory that is very similar to the concept of a physical telephone directory.

How to add the X500 proxy address in exchange 2016?

You can also add the X500 Proxy Address in the Proxy Address Section of Microsoft Exchange. In this example, I will do this in Exchange 2016 1. Log into the Exchange Admin Center 2. Click on Recipients

What is the X500 DN value for address book objects?

Each Address Book object MUST have a unique X500 DN value. The server stores the X500 DN in the PidTagEmailAddress property, as specified in [MS-OXOABK] section 2.2.3.14 . The following Augmented Backus-Naur Form (ABNF) definition, as specified in [RFC5234] , specifies the format of an X500 DN.