Hi Shirin,
Thanks for posting in the community forum. Are you trying to contact Zalando for customer support? Or are you having issues in your outlook mail not receiving emails for the said contact (Zalando).
It's best to reach their customer support. Navigate to the help and contact page at www.zalando.se/faq/. Click on "Need more help?" in the FAQ, I can choose from 3 options: contact form, chat, and phone.
This is non-Microsoft product/website.