SendX is an email marketing platform popular with SMBs, bloggers, and e-commerce operators in India and emerging markets, offering unlimited emails on paid tiers and a simple drag-and-drop editor. The unsubscribe mechanism uses the {{unsubscribe}} merge tag auto-injected into every campaign footer, and SendX emits RFC 8058 headers automatically once the sending domain is authenticated. Consent is tracked at the list level with an account-wide suppression option available. This guide covers the tag, the list-scope model, and the deliverability considerations for high-volume senders.
SendX unsubscribe link
| Tag syntax | {{unsubscribe}} |
| Placement | Auto-embedded in every campaign footer |
| Scope | Per-list opt-out with account-wide variant |
| Config path | Settings > Sender details > Footer |
| RFC 8058 one-click | Yes, automatic once sending domain is authenticated |
How to add the unsubscribe tag in SendX
Place the merge tag exactly as shown below in the email template. SendX replaces it at send time with a signed URL scoped to the recipient and campaign.
{{unsubscribe}}For custom HTML templates, wrap the tag in an anchor to render a proper hyperlink in the delivered email:
<a href="{{unsubscribe}}">Unsubscribe from this list</a>Auto-embedded in every campaign footer
Yes, automatic once sending domain is authenticated 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.
SendX unlimited email plans use shared IP pools by default. High-volume senders should request a dedicated IP through account settings to isolate reputation from other SendX customers, especially in the India-heavy customer base where consent capture practices vary. Complaint rates above 0.1% can affect the shared pool for all customers.
Testing your SendX unsubscribe link
- Send a test message to a controlled Gmail address you own via the SendX 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
Want the full 222-platform reference?
See the pillar guide with the compliance landscape, the RFC 8058 deep dive, and the unsubscribe tag for every ESP: How to add an unsubscribe link: the complete 2026 guide →
How to add the SendX unsubscribe link (step by step)
SendX drag-and-drop templates include the unsubscribe link in the default footer, but custom HTML templates require the tag inserted manually.
- Open your campaign or template in the SendX editor.
- Add or edit a text block in the footer where the unsubscribe link should appear.
- Insert the merge tag
{{unsubscribe}}. SendX replaces it at send time with a signed URL unique per subscriber. - Wrap it in an anchor with your preferred label:
<a href="{{unsubscribe}}">Unsubscribe</a>. - Add the physical postal address block. SendX reads it from Settings > Sender details.
- Send a test to a seed address and verify the rendered link routes to the SendX-hosted preference page.
List-scope opt-out and account-wide variant
SendX applies unsubscribes at the list level by default. A subscriber who opts out of a campaign is removed from the specific list, staying subscribed to other lists in the account. The account-wide opt-out variant is available via a separate merge tag or via preference center action, giving subscribers full account-level removal control. Multi-brand SendX accounts should carefully classify lists per brand to keep suppression scope aligned with subscriber expectations.
RFC 8058 one-click headers
SendX added RFC 8058 one-click unsubscribe automatically ahead of the Google and Yahoo February 2024 requirements. The List-Unsubscribe and List-Unsubscribe-Post headers inject on every marketing send from domains authenticated under Settings > Sending domains. SPF and DKIM records must be verified. Unauthenticated domains fall back to shared SendX infrastructure without one-click compliance and are strongly discouraged for accounts sending over 5,000 emails per day.
Shared IP pools and dedicated IP requests
SendX unlimited email plans use shared IP pools by default. High-volume senders should request a dedicated IP through account settings to isolate reputation from other SendX customers, especially in the India-heavy customer base where consent capture practices vary. Complaint rates above 0.1% can affect the shared pool for all customers, so audit complaint rates weekly via the SendX Deliverability dashboard. Dedicated IP requires a minimum send volume (typically 100,000 emails per month) to maintain warm sending reputation.
Frequently Asked Questions
What is the SendX unsubscribe tag?
The tag is {{unsubscribe}}. SendX replaces it at send time with a signed URL unique per subscriber. Use it inside an anchor: <a href="{{unsubscribe}}">Unsubscribe</a>.
Does SendX support one-click unsubscribe for Gmail and Yahoo?
Yes, automatically for authenticated domains. SendX injects List-Unsubscribe and List-Unsubscribe-Post headers on every marketing send from domains verified under Settings > Sending domains, satisfying the Google and Yahoo bulk-sender requirements.
Should I request a dedicated IP on SendX unlimited plans?
Yes for high-volume senders over 100,000 emails per month. Dedicated IPs isolate reputation from other SendX customers on the shared pool. Below 100,000 sends per month, shared pools are often better since low volume struggles to maintain a warm dedicated IP reputation.
Can subscribers opt out of one list without leaving all SendX lists?
Yes. SendX default opt-out applies per list. Account-wide removal is available via a separate merge tag or via preference center action, letting subscribers choose granularity.
Can I resubscribe a contact who unsubscribed from SendX?
Not through the API without explicit consent capture. SendX enforces permanent suppression on opt-outs to comply with CAN-SPAM. Reactivation requires the subscriber to re-opt in through a SendX signup form or preference center action.
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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