Too many DNS lookups can lead to several problems:
Performance Issues: Each DNS lookup takes time. Multiple lookups can slow down email delivery, making your campaigns less effective. Increased Latency: High latency can cause delays in email delivery, affecting time-sensitive campaigns. Deliverability Issues: ISPs may flag emails with excessive DNS lookups as suspicious, reducing their chances of reaching the inbox. Higher Costs: Some ESPs may charge more for excessive DNS lookups as they require additional resources.