The official Lineage website warns the players for Hoax Emails claiming to be from NCsoft/NCinteractive:

We have received reports of hoax e-mails being distributed with a faked return e-mail address of support@ncinteractive.com which request account information, including account passwords, for verification/investigative purposes. If you receive any suspicious e-mail communications purporting to be from NCsoft or NCinteractive and you have not contacted us using the Support site or by e-mailing us directly, please forward that e-mail to us through the Customer Support tool rather than answering the e-mail directly. If the e-mail in question is not from NCsoft or NCinteractive, we will inform you as such and take steps to prevent any further fraudulent e-mails.

Please treat any e-mail attachments you may receive with caution; a number of computer viruses and Trojan programs are transmitted via this method. As a general practice, NCsoft/NCinteractive does not send out e-mail attachments.

If you are asked for your account login information (login and password) via e-mail, do not provide that information. NCsoft/NCinteractive will never ask you for your password information.

Please review our Security FAQ for information on how you can further ensure the security of your Lineage account.