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INTEGRATIONS • 7 MIN

The HubSpot Sendblue Integration for iMessage

For teams using iMessage for sales outreach: what Sendblue adds to HubSpot, what it logs, the per-line sending limits, and the gaps in its documentation you need to cover yourself.

By the PipelineSync team Updated

PipelineSync field guide

What does the HubSpot Sendblue integration do?

It sends and syncs iMessages from HubSpot. A Sendblue card on the contact record sends messages, workflow actions such as Send iMessage reach contacts automatically, and conversation activity is written back to the contact. When iMessage isn't available, Sendblue can fall back to RCS or SMS. Enterprise installs add inbox messaging and deal-record cards.

Sendblue builds the app, which is listed in HubSpot's App Marketplace. This guide follows Sendblue's and HubSpot's documentation as of October 2026. It's a newer integration with less documentation than SMS tools, so the guide says plainly where something isn't documented.

What do you need to connect Sendblue to HubSpot?

An active Sendblue subscription with outbound messaging, a HubSpot Super Admin or user with App Marketplace access, and a choice between the Pro and Enterprise install options. Workflow actions need a HubSpot Professional or Enterprise subscription, according to HubSpot. Sendblue's listing says the inbox needs Sales or Service Hub Professional, and lines are dedicated iMessage numbers.

  • Pro install: contact activity, workflow actions and message sync.
  • Enterprise install: adds HubSpot inbox (custom channel) messaging and deal-record cards.
  • Numbers: recipients see the line's real number, and messages from one number can't be split into separate threads.

How do you set up Sendblue in HubSpot, in order?

In Sendblue, open Settings, Integrations and choose to sync messages back to the CRM, then sign in to HubSpot and choose the account. In HubSpot, add the Sendblue Contact Message card to the contact view under Connected Apps, set your default sending number, and test with internal contacts before adding workflow actions.

  1. 01 ConnectSendblue settings
  2. 02 Contact cardAdd to the view
  3. 03 Default numberPer line
  4. 04 Opt-out propertyKept in HubSpot
  5. 05 TestInternal contacts
The setup in five stages. Each one is described in the list below.
  1. Connect from Sendblue's integration settings and choose your HubSpot account.
  2. Add the card in HubSpot under Settings, Integrations, Connected Apps, Sendblue, App Settings.
  3. Set the default sending number.
  4. Create an SMS opt-out property in HubSpot, since Sendblue doesn't document syncing opt-outs.
  5. Test sends, replies and logging on internal contacts.

What are Sendblue's sending limits?

Sendblue limits each line. Its limits page listed 50 new contacts a day and 15 an hour on Blue Ocean lines when we checked in October 2026. Before a contact replies, messages can't contain links, media, phone numbers or email addresses, must be 300 characters or fewer, and stop after six. Lines also stop after 150 unanswered messages.

  • Phone format: numbers must be in E.164 format, with the country code.
  • Links: Apple doesn't expand links from senders who aren't in the recipient's contacts, so Sendblue suggests sending a contact card.
  • API sends: messages sent through Sendblue's API aren't automatically synced to integrated platforms such as HubSpot.

How should you handle opt-outs and consent with Sendblue?

Sendblue suppresses a number after a reply such as STOP, QUIT, END, CANCEL or UNSUBSCRIBE, until the contact replies START. It doesn't document syncing that to HubSpot, so record opt-outs in a HubSpot property and exclude those contacts from every workflow. Get consent before messaging, and take legal advice on US rules such as the TCPA.

Sendblue's own guidance calls its compliance articles product guidance, not legal advice. We recommend clear identification and opt-out wording in outreach, whatever channel delivers it.

Planning iMessage outreach from HubSpot? Bring your sequence to a free 30-minute call and we will check the limits, logging and opt-out handling.

What doesn't Sendblue document about HubSpot?

When we checked in October 2026, Sendblue's documentation didn't say how it matches messages to HubSpot contacts, which properties it creates, whether opt-outs sync, or what happens when you uninstall. Its marketing page mentions iMessage steps in HubSpot sequences, but HubSpot's sequence documentation doesn't list them. Test each of these before relying on it.

HubSpot Sendblue checklist

✓
Install option chosen
✓
HubSpot tier checked for workflows
✓
Phones in E.164
✓
Contact card added
✓
Opt-out property in HubSpot
✓
Opted-out contacts excluded
✓
First messages without links
✓
Volumes within line limits
✓
SMS fallback wording checked
✓
Logging tested

Key takeaway: Sendblue brings iMessage into HubSpot, with strict per-line limits and gaps in its documentation. Keep opt-outs in HubSpot, plan for SMS fallback and test logging before you scale.

Frequently asked questions

What does the Sendblue HubSpot integration do?

It lets teams send iMessages from HubSpot and syncs the conversations back. Sendblue's contact card sends messages from a contact record, workflow actions can send messages, and conversation activity is written to the contact. Sendblue's listing says Enterprise installs add HubSpot inbox messaging and deal-record cards. Sendblue builds the app.

Does Sendblue send SMS when iMessage isn't available?

Yes. Sendblue's HubSpot listing says it can fall back to RCS or SMS when iMessage is unavailable, and its developer documentation said, when we checked in October 2026, that there's no account-wide option to turn that downgrade off. Plan message content that works as a plain text too.

Which HubSpot plan do you need for Sendblue?

Sendblue's listing offers Pro and Enterprise install options and says the inbox needs Sales or Service Hub Professional. HubSpot's own documentation says workflows need a Professional or Enterprise subscription, so the workflow actions won't run on HubSpot's free tools even though the listing marks them free.

How many iMessages can you send per day with Sendblue?

Sendblue limits each line. When we checked in October 2026, its limits page listed 50 new contacts a day and 15 an hour on its Blue Ocean lines, and before a contact replies, no links or media, up to 300 characters and up to six messages. Check your own plan's limits.

Do Sendblue opt-outs sync to HubSpot?

Sendblue doesn't document that. It suppresses a number in Sendblue after a STOP-style reply until the contact replies START, but its own help article warns that suppressions aren't mirrored to other systems unless you sync them. Record opt-outs in HubSpot yourself and exclude them from workflows.

Sources

HubSpot documentation behind the feature and tier notes above, checked October 2026. HubSpot changes features and tiers often, so check your own portal too.

Related resources

Want Sendblue set up for you?

We connect Sendblue, build outreach workflows within the line limits, keep opt-outs in HubSpot and test logging end to end. Book a free consultation to scope it.