I use Outlook on an Android phone and have just noticed that the avatar that appears next to a sender is mildy NSFW.
The sender is ebay @ ebay.co.uk.
The emails are genuine, e.g. order confirmations, please leave feedback, etc.

I have no idea what is causing this. I have not loaded the picture and have to assume that the avatar has not been put there by ebay.

How do I edit or get rid of it?
Ebay are not in my contact list.
When I access outlook via the web rather than the android app there is no picture, just the usual 'E'.

Any ideas? Googling has prove fruitless.