No — not the scraped, resold kind. Purchased lists bounce hard (poisoning your sender reputation), hit spam traps planted specifically to catch list-buyers, convert dismally, and in consent-required jurisdictions create legal exposure. The damage lands on your domain, not the seller's.
The legitimate version of 'buying contacts' is licensed B2B data from providers that verify addresses and publish accuracy rates — usable for targeted cold outreach with proper infrastructure and verification before sending.
Either way, verify every address before it's sent to (bounce rates above ~5% are a stop signal), and never point cold outreach at your primary domain.