Outreach is the enterprise-scale sales engagement platform serving large B2B revenue teams with multi-touch sequences across email, phone, LinkedIn, and SMS. The unsubscribe mechanism uses an opt-out merge variable placed in the email body and, unlike marketing platforms, the opt-out is tracked at the prospect record level with Salesforce and HubSpot CRM sync. Outreach applies opt-out enforcement across all sequences owned by the account, plus a sequence-level compliance filter. RFC 8058 compliance depends on the sending mailbox (Google Workspace, Microsoft 365) authentication with proper DKIM and DMARC.
Outreach Io unsubscribe link
| Tag syntax | {{opt_out_link}} |
| Placement | Manual placement in the email body |
| Scope | Account-wide prospect opt-out with CRM sync |
| Config path | Admin > Compliance > Opt-out settings |
| RFC 8058 one-click | Depends on connected mailbox (Google Workspace, Microsoft 365) authentication |
How to add the unsubscribe tag in Outreach Io
Place the merge tag exactly as shown below in the email template. Outreach Io replaces it at send time with a signed URL scoped to the recipient and campaign.
{{opt_out_link}}For custom HTML templates, wrap the tag in an anchor to render a proper hyperlink in the delivered email:
<a href="{{opt_out_link}}">Unsubscribe from this list</a>Manual placement in the email body
Depends on connected mailbox (Google Workspace, Microsoft 365) authentication The recipient's mailbox provider (Gmail, Yahoo) uses the List-Unsubscribe-Post header to expose the native one-click button on the message. Requires domain authentication with DKIM and DMARC.
Outreach opt-out enforcement checks the prospect record at send time, but if the prospect has multiple email addresses on the record, only the specific address that received the opt-out link is suppressed. Add sequence-level compliance rules to block all addresses on the same prospect record after any opt-out.
Testing your Outreach Io unsubscribe link
- Send a test message to a controlled Gmail address you own via the Outreach Io campaign preview action
- Click the footer unsubscribe link and confirm the opt-out on the landing page
- Check the subscriber or contact record: the status should be Unsubscribed within seconds
- Verify the RFC 8058 headers in Gmail: open the message, click three dots, then Show original. Look for
List-UnsubscribeandList-Unsubscribe-Post: List-Unsubscribe=One-Click
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Outreach and B2B sales engagement
Outreach is a sales engagement platform used by B2B sales teams for prospecting sequences, meeting scheduling, and pipeline coordination. Its unsubscribe mechanism uses the {{opt_out_link}} merge variable, replaced with a signed URL at send time. Unlike marketing ESPs that inject an unsubscribe link into every email, Outreach makes the opt-out link optional at the sequence level: sales reps typically include it in prospecting sequences but omit it from personal 1:1 replies, matching the tone of legitimate sales conversation.
CAN-SPAM in the sales context
US-directed prospecting under CAN-SPAM requires an unsubscribe mechanism, and Outreach makes this available. However, EU prospecting under GDPR generally requires prior consent before any outreach, and unsubscribe links do not solve that requirement. Outreach does not enforce geographic gating, so sales teams are responsible for their own compliance with local rules. Outreach compliance layer tracks opt-outs at the account level, preventing accidental re-outreach to prospects who have unsubscribed.
RFC 8058 headers for sequence sends
Outreach adds RFC 8058 one-click unsubscribe headers on sequence-based sends from authenticated domains. Domain authentication is completed under the Sending settings, and Outreach verifies SPF and DKIM records before enabling one-click headers. This is important for high-volume sales teams sending significant Gmail volume: without one-click headers, Gmail applies stricter filtering to sequence traffic, and sequence deliverability degrades. For 1:1 personalized outreach at low volume, RFC 8058 requirements are less strict but still worth respecting.
Opt-out cascade across sequences
An opt-out click in Outreach removes the prospect from the current sequence and, based on account settings, either from all sequences (account-wide) or just that one (sequence-scoped). Account-wide is the safer default for consumer-facing brands; sequence-scoped is common for enterprise teams that operate multiple products with distinct outreach programs. The Outreach compliance dashboard shows opt-outs per sequence and provides reconciliation tools for keeping the platform in sync with external CRM systems.
About the Author
Alaa · LinkedIn
Email infrastructure specialist with 8+ years of hands-on experience in SMTP, deliverability, and email verification. I’ve configured and troubleshot mail systems across Postfix, Exchange, and cloud relays, managed IP reputation and warmup campaigns, and built verification pipelines processing millions of addresses. My work spans DNS authentication (SPF, DKIM, DMARC, BIMI), bounce handling, blocklist monitoring, and compliance frameworks including CAN-SPAM and GDPR. I write every article on SMTPedia to give email professionals, developers, and marketers the accurate, RFC-grounded reference they need.
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