Incredibly effective if done right. Which means, starting by highly targeted prospecting, reaching out based on a trigger event which would indicate buy intent and then crafting a compelling message with adequate follow ups - multi-channel.
Although the response rates are low, it does promise high reachability. Consistent email marketing has generated a good amount of leads in my experience
ResumeSeed
Lyrist
Xence by Gaspar AI
Neverinstall