Thank you for inquiry.
Could you please post the sample EML file here for our reference? You may post here or zip/send me as email attachment using the “Contact” – “send saqib.razzaq an email” button on this thread.
Thanks for sending the sample file. I have reproduced the issue at my end and logged this bug (ID: 26702). We will look into it and will inform you when it gets fixed. Sorry for the inconvenience.
We are working on this issue and will try our best to roll out the fix in the upcoming release 6.5, which will be available at the end of this month.