.png?width=100&auto=webp&quality=80&disable=upscale "Picture of John Savill")
.png?width=400&auto=webp&quality=80&disable=upscale "John Savill")
Sign up for the ITPro Today newsletter
Stay on top of the IT universe with commentary, news analysis, how-to's, and tips delivered to your inbox daily.
How can I stop the Exchange SMTP service performing reverse lookups?
John Savill
January 12, 2000
1 Min Read
A. Some SMTP hosts do a reverse Domain Name Service (DNS) lookup forsecurity reasons when an SMTP connection is established. If this reverse lookupfails to resolve properly, they will possibly drop the connection.
To disable reverse lookup for Exchange perform the following:
Start the registry editor (Regedit.exe)
Move to HKEY_LOCAL_MACHINESystem|CurrentControlSetServicesMSExchangeIMC Parameters
Double click on DisableReverseResolve (or create of type DWORD if not there)
Set the type to binary and enter 1. Click OK
Close the registry editor
About the Author
You May Also Like
.jpg?width=700&auto=webp&quality=80&disable=upscale)
