JS: I use a combo of Instagram, Google and Linkedin to figure out contacts and email address styles. Also, I trade contacts with friends and we’ve even created a spreadsheet that we keep updated. Never buy a list because most of the time they are out of date.
CC: I use Mailchimp and have built my list with the help of Hunter.io, Linkedin, reading mastheads, keeping an eye on who other photographers mention and follow on Instagram, my agents, and asking the communities I’m a part of if they can share contacts from specific brands/publications.