On the contrary I am hearing the second one for the first time....frankly the first and the third have worked for many I know. Haven't heard anyone mentioning the second one.I have seen 3 different email IDs for NDVO
DELHI-IMMIGRATION@international.gc.ca
DELHIIMMIGRATION@international.gc.ca
delhi-im-enquiry@international.gc.ca
Which one works? I sent an email to delhiimmigration@international.gc.ca and got acknowledgement of receipt immediately. My file was approved on December 3rd, 2018.
For me, nothing has worked so far. My file is in Ottawa as per the Agent I talked to on Dec 22