I am Admin of a Zoho Mail server and we have distribution lists along with user accounts. 

I am able to set Profile picture for the users and it shows when the email is sent to another companies.

The members of the groups can also send email from those group email addresses.

We have set profile pictures for those distribution lists as well.

But when our users send email from the distribution lists, the profile pictures do not appear in the recipient's mailbox.

I do not see any visibility settings for profile pictures in settings. Please let me know how the profile picture can be visible to others.