Operations << >>

Disabling ESMTP Support

You can disable ESMTP, which prevents the Microsoft Exchange Server computer from responding to an EHLO command with a list of supported ESMTP commands. You disable ESMTP when you want clients to stop issuing ESMTP commands.

You can disable ESMTP using the Windows NT registry.

  1. Open Regedit.exe or Regedt32.exe.
  2. Open the following registry keys:
    3. HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\
    MSExchangeIMC\Parameters
  3. If you are using Regedit.exe, choose Edit, and then choose New DWORD Value. If you are using Regedt32.exe, choose Edit, and then choose Add Value.
  4. If you are using Regedit.exe, type AdvertiseSMTPExtensions; under Value data, type 0. If you are using Regedt32.exe, type AdvertiseSMTPExtensions; under Data Type, choose REG_DWORD.
  5. If you are using Regedt32.exe, under Data, type 0.