https://www.whois.com/whois/poloniex.com

Dunno if this info will help at all

DOMAIN INFORMATION
Domain:poloniex.com
Registrar:NetEarth One Inc. d/b/a NetEarth
Registration Date:2014-01-10
Expiration Date:2019-01-10
Updated Date:2015-12-13
Status:clientTransferProhibited
Name Servers:chuck.ns.cloudflare.com
uma.ns.cloudflare.com

REGISTRANT CONTACT
Name:Tristan D'Agosta
Organization:Poloniex, Inc.
Street:5 Middlesex Ave, 4th Floor, Suite 400
City:Somerville
State:Massachusetts
Postal Code:02145
Country:US
Phone:+1.3025186536
Email:email@poloniex.com

ADMINISTRATIVE CONTACT
Name:Tristan D'Agosta
Organization:Poloniex, Inc.
Street:5 Middlesex Ave, 4th Floor, Suite 400
City:Somerville
State:Massachusetts
Postal Code:02145
Country:US
Phone:+1.3025186536
Email:email@poloniex.com
TECHNICAL CONTACT
Name:Tristan D'Agosta
Organization:Poloniex, Inc.
Street:5 Middlesex Ave, 4th Floor, Suite 400
City:Somerville
State:Massachusetts
Postal Code:02145
Country:US
Phone:+1.3025186536
Email:email@poloniex.com

Other emails they have:

marketing@poloniex.com
support@poloniex.com
admin@poloniex.com
email@poloniex.com
tristan@poloniex.com