So, official solution from Oracle: "You can use the outlook, Mozilla Thunderbird E SR 17.0.5 version and the problem is not getting reproduced with this mail client. Problem doesn't get reproduced with zimbra client as well. Please use the other email client where the problem won't come. This is due to the mail client. So,…

Thank you for answer. I will open an SR. Unfortunately, in production environment we are still on 11, we hope to move to 12 in two months but G Suite will be obligatory for everyone earlier. So i still need a solution for 11 that can be applied on server side.

It's just a name created for tests but you're right that the issue only happens when there is special character into attachment name. Our current workaround is to not use special characters. I saw that note (2353473.1) but it only suggests workarounds that are not acceptable for us. I hoped that note 'OBIEE : Email Subject…

Here it is clearly visible, that there is a space at the end of the name: --------------SASCH-Part-Level0 Content-Type: application/octet-stream Content-Disposition: attachment; filename="Analysis Name ĄĘ.pdf " Content-Transfer-Encoding: base64