SMTP enabled server instances

From 99Stack Cloud Docs

Every account is eligible to deploy a SMTP enabled server instance by default. Note that by default all server instances are delivered with port 25, 465 and 587 closed. To enable SMTP, follow these three simple steps:

  • Create a new server instance, choose a G3 plan (any 3xx region)
  • Toggle the "Enable SMTP" option, which is now available
  • Head over to the "Up-front" tab and select "3 days (smtp compatible)" or higher.

On demand or reserved

There are two different types of SMTP enabled servers. First one is: "on demand", which is billed by the hour with a minimum lifetime of 3 days (72 hours). On demand server instances comes with a SMTP subscription fee of $0.03/hr to ensure that the ip address assigned to your server instance is whitelisted. To avoid this fee completely, we also offer a second type of SMTP enabled server type called "reserved instance".

To get the most for your money, we recommend a "reserved instance", when dealing with direct emails. A reserved instance offers up to 20% discount and requires at least 3 months of reservation time. A reserved instance means that you get a clean ip address and keep it for the entire lifespan of the server instance. It's up to you to ensure that your emails are compliant with EU anti spam laws, GDPR and other regulations in order to avoid getting blacklisted.


It's recommended to first test the server performance on a non SMTP enabled server plan, for a minimal cost and with hourly billing. Once you order a SMTP enabled server there is a minimum time before it can be removed. In accordance with the distance purchase law (SE 2005:59) you may cancel a SMTP subscription for up to 14 days after purchase, and get a refund to your account balance.

In order to request a refund, contact support. Note that is may take a few days before any payout is made. This is to give service providers and users affected by spam a chance to file a complaint. If your server instance has been involved in distribution of spam, there are no refunds.