Key things to consider when choosing an ESP:

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ConvertKit (now often referred to as Kit): Specifically designed for creators, offering tools for building landing pages, email sequences, subscriber tags, and direct selling of digital products/subscriptions.
Beehiiv: A rapidly growing newsletter platform that is user-friendly and offers strong features for monetizing newsletters, including paid subscriptions.

Your budget: Free plans are great to start, but paid plans offer more features and higher sending limits.
List size: Pricing typically scales with the number of subscribers.
Required features: Basic newsletters vs. advanced automation, segmentation, e-commerce integrations, CRM, etc.
Ease of use: How intuitive is the interface country wise email marketing list for your team?

Customer support: What level of support do you need?
Deliverability: A crucial factor – how well does the ESP ensure your emails reach the inbox? (Reputable ones are generally good).
2. Best Lead Generation / Data Providers (for acquiring lists)
A critical caveat: While these providers offer "email lists," it's crucial to understand that using purchased or non-consented lists for cold email marketing can be risky and illegal under regulations like GDPR, CASL, and even CAN-SPAM if not handled correctly. The "best" use of these services is often for B2B prospecting and sales intelligence, where you identify potential leads and then engage with them through compliant methods (e.g., personalized outreach, LinkedIn, or inviting them to opt-in).