Open the machine → Network tab.
Floating IPs
The Floating IPs panel lists every public address routed to this machine. A floating IP belongs to your organization rather than to the machine, so you can move it to another server later without changing the address — see Floating IPs for the full model.
- Click Add IP to attach another address. Only IPs in the same location as the machine can be attached.
- The primary IP can't be removed; it's the address the machine boots with.
- DDoS Protection status per IP is shown here, and links through to DDoS Mitigation.
Reverse DNS (rDNS)
Set a PTR record inline for each IP, for example mail.example.com. This matters most for outbound mail: many receiving servers reject or spam-folder mail from an IP whose reverse lookup doesn't resolve, or doesn't match the sending hostname.
Private network
Attach the machine to a private network so it can talk to your other servers over internal addresses instead of the public internet.
Pick a network from Select a network and click Attach. The network must already exist in the same location as the machine — if the dropdown is empty, create one there first. Detach removes it.
NoteAfter attaching or detaching a private network, restart the machine for the change to take effect.
Blocked SMTP ports
Outgoing traffic to ports 25 and 465 is blocked by default on all Cloud Servers. Spammers routinely abuse cloud infrastructure to send mail, so blocking these by default is standard practice across the industry, and it's what protects the reputation (and deliverability) of the whole IP range.
Use port 587 instead. It's not blocked, needs no request, and it's the industry-recommended submission port for sending mail through an external delivery provider. For the overwhelming majority of applications this is the right answer.
If you genuinely need direct SMTP, use Request Unblocking on this tab to open a ticket. Requests are reviewed case by case and require:
- The machine to have completed at least one full billing cycle
- The first invoice to be paid
- A clear description of the use case, the software that will send mail, and confirmation that it complies with anti-spam policy
WarningPort blocking is enforced per account. If you move a server to another project or account, the new owner's rules apply — a server with ports unblocked will have them blocked again if the destination account isn't cleared. Check this before transferring anything that depends on SMTP.