Help Center > > FAQs> Network Configurations> EIP FAQs> What Do I Do If Outbound Access Through TCP Port 25 Is Restricted?

What Do I Do If Outbound Access Through TCP Port 25 Is Restricted?

Updated at: Jan 16, 2020 GMT+08:00

Symptom: TCP port 25 cannot be used to access an external address. For example, you cannot run the Telnet smtp.***.com 25 command.

Cause: Outbound traffic from TCP port 25 is denied by default.

Solution: Request to allow outbound traffic from TCP port 25.

Before sending the request, you must agree and guarantee that TCP port 25 is only used to connect third-party Simple Mail Transfer Protocol (SMTP) servers and that emails are sent using the third-party SMTP servers. If you use the EIP specified in the service ticket to directly send emails over SMTP, we will permanently disable TCP port 25 for you and will no longer enable it even you request.

  1. On the Create Service Ticket page, choose Products > Elastic Cloud Server.

    For details about how to submit a service ticket, see Submitting a Service Ticket.

  2. Click Open Port 25 under Select Subtype and click Create Service Ticket.
    Figure 1 Creating a service ticket
  3. On the displayed page, enter the required information as prompted.

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