The easiest way for troubleshooting would be checking the Recipients tab and Not sent section of the sent email.
If the contacts are listed there, you'll see explanations as to why contacts were not sent the email. These can include the following:
Are you using the marketing contacts functionality? If yes, are all recipients marked as marketing contacts? (HubSpot will not send emails to non-marketing contacts.)
Have some of the contacts previously bounced? You can check by filtering your recipient list by "Email hard bounce reason is known". This could also be global bounces (contacts that did not bounce in your portal but three other HubSpot portals).
The easiest way for troubleshooting would be checking the Recipients tab and Not sent section of the sent email.
If the contacts are listed there, you'll see explanations as to why contacts were not sent the email. These can include the following:
Are you using the marketing contacts functionality? If yes, are all recipients marked as marketing contacts? (HubSpot will not send emails to non-marketing contacts.)
Have some of the contacts previously bounced? You can check by filtering your recipient list by "Email hard bounce reason is known". This could also be global bounces (contacts that did not bounce in your portal but three other HubSpot portals).