In the meantime, I have lost possession of the email address I have used to create my Poloniex account. I wanted to re-loggin now to my account so I've reached out to Poloniex Support to change the mail address so I can log in again. Indeed I was awaiting some sort of owner verification to assure I'm the owner of that account.
You have to secure your email and your account on Poloniex, passwords, 2FA, etc. It is abnormal if exchange allow you to change your email address.
It is suspicious change if you even can not log in your account and initial email.
Exchanges don't take risks and let customers change account information (initial email to new email) after access is lost like you. If any exchange provides recovery by ID verification or address verification, it is good for their customers but you can not blame if they don't provide. I don't investigate account recovery process guide but if their guide does not mention about such procedure, you lose one more point.
I don't protect Poloniex, frankly.
8. SECURITY OF USER INFORMATION
You are responsible for maintaining the confidentiality and security of any and all account names, User IDs, passwords and any other security feature that you use to access the Services. You are responsible for (i) keeping your email address up to date in your Account profile and (ii) maintaining the confidentiality of your User information and the security of your Account, which includes the enabling of all relevant security features. You agree to notify Polo immediately if you become aware of any unauthorized use of the Services or any other breach of security regarding the Services. Polo will not be liable for any loss or damage arising from your failure to protect your Account or your User information.
We shall not bear any liability for any damage or interruptions caused by any computer viruses, spyware, or other malware that may affect your computer or other equipment, or any phishing, spoofing, or other attack. We advise the regular use of a reliable virus and malware screening and prevention software. If you question the authenticity of a communication purporting to be from Polo, you should login to your Account through the Poloniex website (poloniex.com) (the “Site”) or via the App, not by clicking links contained in emails.
We use reasonable efforts to protect your Account, and we need you to do the same. It is important that you always protect not only your password but also the email account associated with your Account and any device used to access your Account. We strongly advise you to enable two-factor authentication: this offers you greater protection from possible attackers attempting to log in to your Account than password alone and in situations where your email and/or password is compromised by a third party data breach.
https://poloniex.com/terms/Email Address
Due to security precautions, it is not possible to change the email address that was used to create your account at the time of registration.
If you have access to the email you'd like to switch, simply create a new Poloniex account and transfer your funds from the original account to your new account.
https://support.poloniex.com/hc/en-us/articles/360040029833-How-to-Update-Your-Account-Information
