Deliverability is influenced by several factors related to mail servers:
Reputation: The reputation of the sending server is crucial. Servers with a history of sending spam are often blacklisted, affecting their ability to deliver emails. Authentication: Properly configured authentication protocols like DKIM, SPF, and DMARC help verify the sender's identity and improve deliverability. Configuration: Correctly setting up reverse DNS, MX records, and other server configurations prevent emails from being marked as spam.