BleepingComputer reports that hacked Mailchimp, SendGrid, Mailgun, HubSpot, and Zoho accounts have been harnessed for the mass distribution of crypto seed phrase-containing emails aimed at compromising Coinbase and Ledger cryptocurrency wallets as part of the widespread PoisonSeed campaign, which has already impacted the Mailchimp account of Have I Been Pwned administrator Troy Hunt and certain Coinbase users last month.