Avira for Exchange checks the TNEF checksums generated by Microsoft Exchange.
In this case, the checksum seems to be wrong, so Avira Exchange sends the email to quarantine:
Job "Scan with Avira Engine": Mail failed on job processing. Reported reason: Invalid TNEF checksum in tag '0x69004' (RecipTable)! (0xbc9a instead of 0xbc92).
There can be various causes for this problem, but they are mainly related to the internal infrastructure. Avira Exchange Security does not change any TNEF checksums.
You can deactivate the checking of TNEF checksums in Avira Exchange Security, to smooth the email processing:
- Add the following key (DWORD) in the General section of the Registry:
TNEFIgnoreChecksums = 2
- Restart the service Avira Exchange Security Control.
- Avira Exchange Security will stop checking TNEF checksums.