It is very tough for job portals to differentiate these days. Hence, it is very essential for them to keep on trying new ideas and hacks to get the attention of registered users. With demonetisation being a hot topic in India these days, lot of digital players have encashed this opportunity as it's a direct fit.
However, for job portals to use it in a creative way like how it is done by Timesjobs in its email marketing is definitely a good hack that I am sure would definitely increase the open rates.