0x8000FFFF access violation when disposing Redemption RdoMail object


Six of our 400+ users reported this error in the last two months:

System.Runtime.InteropServices.COMException (0x8000FFFF): Access violation at address 0000000000D7BA95 
in module 'Redemption64.dll. Read of address FFFFFFFFFFFFFFFF 
at System.IDisposable.Dispose()

This exception is raised just after a mail is saved on the user drive. The code that raises this exception is:

var msg = rdoMail as IDisposable;
if (msg != null)

Any idea why this error occurs once in a while?


  • Our Outlook 365 client version is "Product ID Version 2008 (Build 13127.20408 Click-to-Run Semi-Annual Entreprise Channel (Preview)"
  • The Redemption64.dll file version:
asked on Stack Overflow Sep 16, 2020 by Sylvain Rodrigue • edited Sep 16, 2020 by Sylvain Rodrigue

1 Answer


This problem (64 bit specific) was fixed about a month ago after version 5.24 was released. Please send an email to redemption (at) dimastr (dot) com for an updated version.

User contributions licensed under CC BY-SA 3.0