|Port X seems to be blocked on my VPS, are you blocking it?
We block several ports that are commonly abused for DDOS attacks. This includes TCP and UDP ports 17, 19, 1900. These blocks are permanent, and cannot be removed. Depending on your account, outbound 53413 UDP and SMTP (port 25) may also be blocked. This block may be removed by opening a support ticket. Also note that many operating systems are configured with firewalls which block traffic. You would need to open any ports you need within your VPS's firewall.
|Do you allow outbound SMTP?
In some instances, outbound traffic to the SMTP port may be blocked for new accounts. If you encounter this restriction, contact our support team from the customer portal.
【时间17:00】提交ticket：please unblock port 25，My wp blog needs to use smtp，thank you。
I have removed the default SMTP block on your account. Please restart any active instances via https://my.vultr.com for the change to take effect (restarting via the server itself _will_not_ work).