I have used Mystrika for many years and it does cold emailing well. Cold emailing is complex (email warm-up, writing a successful multi step email non-spammy sequence, 20 emails per day maximum, 3 emails max per domain etc) and if you do it right, Mystrika is for you. If you do cold emailing wrong, no software will work for you long-term. Mystrika needs some updates but for the job it does and at the value it offers, it's a no brainer.