Knowledge Base

Target server mailbox addresses are not resolving


Target server mailbox addresses are not resolving in CodeTwo Exchange Migration or CodeTwo Office 365 Migration.


In some migration scenarios such as a cross-domain migration the target server email addresses do not resolve and are not listed. Target mailbox address must be in that case typed in. The possible reasons are:

  • Related to acceptance of PowerShell connections by the target server - WinRM may be not working on the target server.
  • Caused by firewall, router or antivirus settings blocking PowerShell ports either on source or target server (by default these are the following TCP ports: 80, 443, 5985, 5986).
  • Target server domain is improperly configured at your domain register (e.g. points at old server).
  • Your source server side DNS forwards target domain queries somewhere else.

See also:

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