Good day, everyone. John is my name. I'm a customer care agent who specializes in technological issues. Many people wonder, "How can I set up 1and1 email setup iphone?" IMAP is the current standard for email synchronization. Keep them in mind. Maintain IMAP as the inbound server. imap.1AND1.com will be the incoming server. The inbound port will be 993, and SSL will be used for authentication.