Rising Junior: Need Help Network for IB

Hi guys! I'm a rising junior at WashU in St. Louis looking to get into IB and recruiting this fall. I'm struggling a lot with networking, and have tried a lot, including alumni search on LinkedIn etc and cold emailing. A good example is JP Morgan, most of their email formats are john.a.doe@JPMorgan or an x if they don't have middle initial, which makes it really hard to contact them.

For eg, I just got an email contact of an analyst at JP, which is definitely verified to be correct, but it's still bouncing. (format is john.doe@jpmorgan)

I decided to make an account here to ask how to reliably get contact info for IB networking, specifically bulge brackets.

Thanks a lot in advance guys!