DOCUMENT:Q155920 04-APR-1999 [exchange] TITLE :XFOR: Setting Accept/Reject by Host in IMC Connection Settings PRODUCT :Microsoft Exchange PROD/VER:winnt:4.0 OPER/SYS: KEYWORDS:kbusage ====================================================================== ------------------------------------------------------------------------------- The information in this article applies to: - Microsoft Exchange Server, version 4.0 ------------------------------------------------------------------------------- SUMMARY ======= The Microsoft Exchange Server Administrator's Guide, pages 332-338, explains how to set up the Connections Property page for the Internet Mail Connector (IMC). However, the documentation on Accepting or Rejecting by Host setting does not state the effect of setting this feature, that is, whether a Non-Delivery Report is sent or connections are simply refused. If you set the Reject by Host setting, all hosts that fit that masked IP range will get the following error when attempting a connection: 521 access denied If you set the Accept by Host setting for a Masked IP range that falls under an entry for a Reject by Host, the Accept by Host will override and allow a connection. MORE INFORMATION ================ On the Internet Mail Connector property page, on the Connections tab, under Accept or Reject by Host, you see the following items: First Entry: IP Address = 157.57.10.0 Mask = 255.255.0.0 Action = Reject connection from this Host This first entry will reject all connections from class B domain 157.57. Second Entry: IP Address = 157.57.10.0 Mask = 255.255.255.0 Action = Accept connection from this Host This second entry will accept a connection from class C domain 157.57.10, regardless of the restriction set in the first entry. Host 157.57.10.25 will be granted access. Host 157.57.15.2 will be denied access. Additional query words: ====================================================================== Keywords : kbusage Technology : kbExchangeSearch kbExchange400 kbZNotKeyword2 Version : winnt:4.0 ============================================================================= THE INFORMATION PROVIDED IN THE MICROSOFT KNOWLEDGE BASE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. MICROSOFT DISCLAIMS ALL WARRANTIES, EITHER EXPRESS OR IMPLIED, INCLUDING THE WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL MICROSOFT CORPORATION OR ITS SUPPLIERS BE LIABLE FOR ANY DAMAGES WHATSOEVER INCLUDING DIRECT, INDIRECT, INCIDENTAL, CONSEQUENTIAL, LOSS OF BUSINESS PROFITS OR SPECIAL DAMAGES, EVEN IF MICROSOFT CORPORATION OR ITS SUPPLIERS HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. SOME STATES DO NOT ALLOW THE EXCLUSION OR LIMITATION OF LIABILITY FOR CONSEQUENTIAL OR INCIDENTAL DAMAGES SO THE FOREGOING LIMITATION MAY NOT APPLY. Copyright Microsoft Corporation 1999.