Knowledgebase: Proofpoint Essentials
[Setup Step 4]: (Optional)]: Instructions on activating Proofpoint Essentials for an organization's outbound email
Posted by Richard Kennedy on 10/03/16 15:24

This article assumes that the organization in question has an active account in Proofpoint Essentials, is using our inbound email service, and has its user email addresses registered in our Interface.

Important Note:  If you activate Essentials for Outbound relaying this means that Essentials will scan for spam and viruses on outbound emails and block as appropriate.

In order to activate outbound relaying, your reseller / Tech Contact will need to be notified of the source IP address (es) from where the organization’s connections will be originating from.  (This must be the server's public internet IP address and not it's private LAN address.  

Dynamic IP addresses are not supported at this time. The change takes effect top of the hour and only once you have been notified that outbound has been activated should you proceed to modify the mail server in question to relay all outbound email through Proofpoint Essentials. This relay setting is sometimes also known as the "smart host" setting.

Resellers are assigned to different sections of our cloud and as such the relay destination you must use for setting up customers will be dependent on your allocation. If you are not already aware of which smart host address have been assigned to your account please contact either support or your account manager.

The relay/smart host destination where all mail should go is the following 2 options:

  1. (For EU users)
  2. (For US users)

You can test connectivity to Proofpoint Essentials by typing and executing the following from a command prompt on the email server of the organization:

telnet 25
telnet 25

You should see a message saying "Welcome to Proofpoint Essentials ESMTP Server", amongst other things. (enter "quit" to close the connection.) If you do not see this message, examine the outbound settings on the firewall between the server and the internet.

Please note: When configuring an Outbound Connector for our smarthosts, authentication is not required. We authenticate the connection by other means (ie, the registered sending server IP on the platform, registered users on the platform, etc).


NB: Please ensure you read the instructions on Firewall Lockdown and include all IP ranges.



  • Using Proofpoint Essentials for outbound email on top of inbound improves the accuracy of the Proofpoint Essentials classification engine in some respects, but especially with bounce emails.
  • Remember to remove the outbound configuration from the Proofpoint Essentials Interface if no longer being used (otherwise legitimate bounce messages might get quarantined. (which the end-user can just release, if so desired)).

Acceptable Usage:

As a committed anti-spam company Proofpoint Essentials cannot condone the use of our platform to send out bulk mail.  Most users respect our fair usage policy and instead use dedicated email marketing systems such as MercuryMessage to send out their bulk mail campaigns. Unfortunately though a small number of users are continuing to abuse the system, either unknowingly or on purpose, however regardless of the intent the sending of spam through Proofpoint Essentials is strictly prohibited.

Secondly, if a user has unwittingly downloaded a spambot from the internet, in sending out huge quantities of email you could be in fact unknowingly distributing said bot to your entire contact base. Thus by placing limitations on a single user’s outbound usage, Proofpoint Essentials can help protect the company reputation.

How we control bulk mail abuse

In order to prevent the sending of spam and bulk mail through our system we have the following limitation in place.

-          Users are only permitted to send out a maximum of 100 emails per 10mins or a sum total of 500 emails per day.

What happens if a user reaches the outbound limit?

If a user hits the outbound limit of 100 emails within 10mins they will automatically be prevented from sending out any more email until a further 10minute period has lapsed.

If the user then continues to reach this 100 email per 10minute limit until they have sent a total of 500 emails within one day, then they will subsequently be prevented from sending any further outbound email for a 24hour period.

Likewise, if a user attempts to send more than a total of 500emails within a 24hour period outside of the 10minute restrictive periods, then they too will have their outbound email capabilities blocked for a further 24hours. 

Will these consequences affect the entire organization?

No, Proofpoint Essentials will not punish the other users within an organization because of the abusive usage of one user. Only the outbound abilities of the user responsible for sending the bulk mail will be

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