Things to know about HubSpot marketing email

HubSpot Employee

New to marketing email on HubSpot? You’re in the right place. 

The purpose of this post is to help email marketers at every level be successful with email on the HubSpot platform, particularly HubSpot Marketing Free users. 


Marketing email can be suspended for exceeding acceptable thresholds. Email suspensions and quarantined lists in HubSpot Marketing Free accounts are permanent. To prevent email suspension, please be sure to clean up your contacts lists of old, invalid, not-opted-in, or otherwise undeliverable contacts before you hit send.
Creating a new HubSpot account after any email protection action does not guarantee access to marketing email and/or quarantined lists.


Things you should know

  • HubSpot is an email-marketing service provider (ESP), meaning we send email on behalf of users though a shared network. A shared network means shared responsibility of all senders for the reputation of the network. Positive sending behaviors means everyone reaps the benefits of great deliverability. 

    On the flip-side, poor sending behaviors — as in, sending to purchased or other 3rd-party lists, not-opted-in contacts, excessive hard bounces, unsubscribes, spam complaints, and blacklisting — impact everyone’s deliverability. Not just one person’s. 

  • Email Deliverability Protection is our first line of defense for the shared network. It enables us to monitor email performance of each send, and ensure low performing emails are stopped to prevent further negative impact to deliverability. 
  • Marketing email can be suspended for exceeding acceptable thresholds or violation of terms of service. The ideal baseline for marketing email thresholds are as follows:
    • Hard bounces - below 1%.
    • Unsubscribes - below 0.3%
    • Spam complaints - below 0.01%

      Anything above these limits can negatively impact the sending reputation of HubSpot’s shared network. And as mentioned above, this means all users’ ability to reach the primary inbox is compromised as a result. Several email protection actions may occur to protect deliverability.

What are the email protection actions?

Your account’s ability to send marketing email can be systematically or manually suspended for exceeding the acceptable thresholds. Email suspensions and quarantined lists in HubSpot Marketing Free accounts are permanent, and it is possible for a suspension to happen after a single send! So the best defense against suspension is following deliverability best practices. Mind your contact sources, make sure you have explicit permission to receive marketing email from every contact on your list, and develop a regular database cleanup strategy. 
Questions or comments? Post ‘em below! 
5 Replies 5



I have imported a list of 749 contacts from Nimble. These are all contacts we have interacted in the past. I want now to send them an email but when I select all 749 contacts on the 'recipients' tab it only says that the email will be sent to 5 in total. Why I cannot send to all 749? Thank you. 

Community Manager

Hello @FabioChaves,


I would recommend checking if the "don't send do nonengaged" is selected, Unengaged contacts are those who haven’t opened your last 11 emails. You can improve your deliverability and engagement rates by not including them in your send. Learn more about unengaged contacts. (Learn more about graymail).




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I inserted list of  my contacts (leads and customers) coming from another CRM, clean up my list of the hard bounced contacts. there is also a list " Formazione" of customer who gave mi directly the mail ( and I have insert it manually) and also this seems to be in quarantine without reasons.

I have about 300 contacts in quarantine. I NEED  to send my newletter to my contacts this week. Ehat can I do to solve the problem?  . I ask for a solution different from sending one to one mail as suggested in the Hubspot knowledge Base.

I read "Email suspensions and quarantined lists in HubSpot Marketing Free accounts are permanent", 

If  iwoukld become a premium customer, what would be the solution? Hoping to have some transparent solutions asap.
Claudia Coppola, a customer of one of your Premium Partner ( Factory Communication).

HubSpot Product Team

Hello @CCoppola ,


Sends from the HubSpot platform can't be used to determine which contacts are no longer valid.  This "list washing" behavior negatively impacts your brand's sender reputation and chances of reaching the primary inbox, and degrades the HubSpot network shared by all users.  To prevent hard bounces in the future, you should:

  • Import an opt out list of all contacts that had previously hard bounced, unsubscribed or marked mail as spam in your previous ESP
  • Be sure that all contacts used in marketing sends meet the minimim requirements, including that they have verifiably opted into your brand and have been emailed outside of HubSpot in the past 12 months
  • You can also use a list validation platform like Kickbox to indetify which contacts may not be valid so they can be removed from your database prior to sending

We are unable to provide an alernate solution for removing contacts from qurantine outside of what is detailed in this help article.   Any contact that replies to a 1:1 email send sent via a connected inbox will automatcially be removed from quaratine. 


Any contact that replies to a 1;1 email sent via a connected inbox is NOT removed from quarantine in my system.