To boost your cold emails' chances of reaching prospects' inboxes and not the spam box, you might want to check out Mailivery. It uses AI-conversational sales and a peer-to-peer network of real email accounts to boost sender reputation and bypass spam detection. Mailivery has real-time analytics and a reputation checker with suggestions, too, so it's a good option for improving email deliverability and getting past spam filters.
Another good option is Instantly, a sales engagement and lead intelligence platform that automates outreach and has a big deliverability network. It's got tools like email validation, bulk domain testing and a network of more than 1 million real human accounts, so you can send thousands of emails a day without worrying about your sender reputation. It's also got campaign analytics and several pricing tiers for different company sizes.
If you want to go more automated, Super Send has advanced sequences that combine Twitter and email interactions and that track user activity with detailed analytics. It's got inbox rotation, reply management and personalized messages, too, so it's a good option if you want to get the most out of your budget and have good quality outreach.