Certain attachments are blocked by Elements Collaboration Protection due to disallowed content.

Issue:

We have certain email attachments that are blocked or quarantined by Elements Collaboration Protection due to disallowed content. The files are clean and how do we solve it?

Resolution:

To resolve the blocked attachment due to the "Disallowed content" verdict, you can either allow the file extension or add the trusted sender email address/domain to the tenant's Elements Collaboration Protection policy.

To allow the file extension:

1. Log on to the Elements portal (https://elements.withsecure.com/)
2. Go to Collaboration Protection > Policies
3. Select the tenant's policy
4. Go to Exchaneg > General > Malware scanning
5. In the Disallowed file types section, click on the Configure file types, and untick the target file type
6. Click Save
   

Add the sender address/domain to exclude attachment scanning:

1. Log on to the Elements portal (https://elements.withsecure.com/)
2. Go to Collaboration Protection > Policies
3. Select the tenant's policy
4. Go to Exchange > General
5. Turn on the 'Trusted senders' option
6. Add the sender email:
   1. email address to the Trusted email sender addresses list if you want to allow a specific email address
   2. domain to the Trusted sender domains list if you want to allow a whole domain
7. Click Save