Can I use a Reserved IP address to send emails via SMTP?
Reserved IPs do not support SMTP traffic. All outbound SMTP traffic originates from the public IP address of the Droplet. Learn more about Reserved IP Limits.
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You cannot retain a Droplet’s IPv4 when you transfer the Droplet to a new region. Use a reserved IP address to maintain a static IP address.
Droplets do not have a dedicated IP address, but you can create a Reserved IP, which is a reassignable static IP address.