Consider the following scenario:
- You operate a Microsoft Exchange Server 2016 environment.
- Cumulative Update 5 is installed for Exchange Server 2016.
- You have an email address policy that generates the first name or last name (%g, %s) as the primary email address for mailboxes.
- You try to create or manage a mailbox that has one of the following umlaut characters in the first or last name: “ä”, “ö”, “ü”, or “ß”. For example, the first name is “Thomas”, and the last name is “Müller”.
In this scenario, you receive an error message that resembles the following:
The address 'SMTP:Thomas.Mÿller@contoso.com' is invalid: Specified argument was out of the rangeof valid values.Parameter name: The address 'Thomas.Mÿller@contoso.com' is not a valid SMTP address.
The characters “ä”, “ö”, “ü”, and “ß” get incorrectly transformed into ”ÿ” instead of “ae”, “oe”, “ue”, or “ss” as expected.
To work around this issue, use one of the following methods:
Replace the umlaut characters “ä”, “ö”, “ü”, and “ß” in the first and last name with “ae”, “oe”, “ue”, or “ss", respectively, for the affected mailboxes.
- Check the alias of the affected mailbox. If the alias also contains an “ä”, “ö”, “ü”, or “ß" character, remove that character.
- Update the email address policy to use the alias as the primary email address. For more information, see Email address policies in Exchange 2016.
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
Microsoft is researching this problem and will post more information in this article when the information becomes available.
Article ID: 4019534 - Last Review: 19 Apr 2017 - Revision: 25