Selzy (formerly UniSender) is an email marketing platform popular in Eastern Europe, Russia, and Central Asia, with strong multi-language and multi-currency support. The unsubscribe mechanism uses the {{UnsubscribeUrl}} merge tag auto-injected into every campaign footer, and Selzy emits RFC 8058 headers automatically once the sending domain is authenticated. This guide covers the tag, the multilingual footer configuration, and how to verify the setup end to end.
selzy (formerly Unisender) unsubscribe link
| Tag syntax | {{{UnsubscribeUrl}}} |
| Alternative | [unsubscribe_link] |
| Placement | Auto-embedded in every campaign footer |
| Scope | Per-mailing-list opt-out with preference center |
| Config path | Settings > Sender > Email footer |
| RFC 8058 one-click | Yes, automatic once sending domain is authenticated |
How to add the unsubscribe tag in selzy (formerly Unisender)
Place the merge tag exactly as shown below in the email template. selzy (formerly Unisender) replaces it at send time with a signed URL scoped to the recipient and campaign.
{{{UnsubscribeUrl}}}For custom HTML templates, wrap the tag in an anchor to render a proper hyperlink in the delivered email:
<a href="{{{UnsubscribeUrl}}}">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.
Legacy UniSender templates use [unsubscribe_link] (square brackets) instead of the modern Selzy triple-brace variant. Both work during the transition period, but the UniSender syntax is deprecated. Update templates during your next major campaign refresh, since Selzy has announced end-of-life for the legacy tag by end of 2026.
Testing your selzy (formerly Unisender) unsubscribe link
- Send a test message to a controlled Gmail address you own via the selzy (formerly Unisender) 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 Selzy unsubscribe link (step by step)
The Selzy drag-and-drop editor injects the unsubscribe link into the default footer block on every new campaign. If you use a custom HTML template or need to place the link somewhere other than the footer, follow these steps.
- Open your campaign or template in the Selzy editor.
- Add or edit a text block where the unsubscribe link should appear.
- Insert the merge tag
{{UnsubscribeUrl}}anywhere in the text. The platform replaces it with a signed URL at send time, unique per recipient. - Wrap it in an anchor with your preferred label:
<a href="{{UnsubscribeUrl}}">Unsubscribe</a>. Localize the label if you send in multiple languages. - Preview the campaign to a test recipient. The rendered link should point to a Selzy-hosted preference page and confirm removal on click.
- Verify the physical postal address block is present (Selzy pulls it from account settings).
How Selzy handles unsubscribes
Clicks route to a Selzy-hosted preference page that confirms removal and adds the contact to the account suppression list. The email editor rejects campaigns saved without an unsubscribe mechanism. Consent is tracked at the mailing list level with a preference center option for topic-level opt-out, so subscribers can opt out of one list without leaving the account.
GDPR compliance orientation
As a European platform, Selzy is GDPR-oriented by default: double opt-in for new subscribers, consent records tracked per contact (timestamp, source, IP), and permanent suppression for opted-out addresses that cannot be forced through the API. Reactivation requires a fresh double opt-in flow initiated by the subscriber. This is stricter than some US-focused platforms but matches European regulatory expectations.
RFC 8058 one-click headers
Selzy added RFC 8058 one-click unsubscribe headers to meet the Google and Yahoo bulk-sender requirements. The List-Unsubscribe and List-Unsubscribe-Post headers are added automatically on sends from authenticated domains. Domain authentication (SPF, DKIM) is completed under the Sender Settings section, which Selzy verifies before enabling one-click headers. Accounts sending from unauthenticated domains fall back to shared Selzy infrastructure and may not qualify for one-click.
Multi-channel opt-out
Selzy supports email, SMS, and Web Push channels within a unified subscriber model. By default, an email unsubscribe removes the contact from email marketing but does not affect SMS or push preferences. Account settings can enforce cross-channel opt-out, applying an email unsubscribe to all channels simultaneously. Consumer brands typically enforce cross-channel; B2B senders prefer per-channel control.
Frequently Asked Questions
What is the Selzy unsubscribe merge tag?
The tag is {{UnsubscribeUrl}}. Selzy replaces it with a signed URL unique per recipient at send time. Use it inside an anchor: <a href="{{UnsubscribeUrl}}">Unsubscribe</a>.
Does Selzy still support the legacy UniSender tag?
Legacy accounts migrated from UniSender may still accept the older tag, but new campaigns should use {{UnsubscribeUrl}}. The Selzy documentation lists any legacy alternatives currently supported.
Can I customize the Selzy unsubscribe page?
Yes on paid tiers. The Selzy-hosted preference page supports branding (logo, colors, language) and a topic-level opt-out UI when the account has multiple mailing lists. Free tier accounts get the default Selzy-branded page.
Does Selzy support one-click unsubscribe for Gmail and Yahoo?
Yes, provided the sending domain is authenticated (SPF + DKIM verified in Sender Settings). Selzy adds List-Unsubscribe and List-Unsubscribe-Post headers automatically for authenticated senders, satisfying the Google and Yahoo bulk-sender requirements.
Can I resubscribe someone who unsubscribed from Selzy?
No, not directly. Selzy enforces permanent suppression on opt-outs and blocks reactivation via API. The subscriber must re-opt in through a signup form on your site, triggering a fresh double opt-in confirmation.
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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