Which links are not allowed in emails sent from SystemeScale?
Every outbound marketing email processed through our servers undergoes rigorous automated scanning by the spam filtration algorithms of Internet Service Providers (ISPs). These anti-abuse engines analyze several componentsβincluding content semantics, metadata tracking strings, and visual stylesβbefore accepting a broadcast and determining its folder placement (Primary inbox, Promotions, or Spam).
Among these core elements, embedded hyperlinks are scrutinized with exceptional rigor. A single non-compliant or malicious URL anywhere inside your email payload can cause immediate delivery failure or domain-wide quarantine. To protect your deliverability channels, you must follow strict guidelines regarding link structure and destination routing.
Hyperlink formatting requirements and banned practices
To keep your workspace completely aligned with security filters, follow these technical best practices:
contacts@abc.com, your target destination links should follow the aligned pattern of www.subdomain.abc.com to build continuous ISP reputation authority.bit.ly or alternative generic shortening domains) within your templates. Because spam rings heavily exploit public shorteners to mask malicious destinations, modern ISP filters systematically flag shortened strings. The final target landing path must remain transparent inside the email body code.Managing third-party links and network security
If you include external reference links provided by a third-party partner, affiliate asset network, or external client, it is your direct operational responsibility to guarantee that those target domain layers are thoroughly secured and clean.
The more an isolated link is duplicated, shared, and dispatched by bulk networks, the more vulnerable it becomes to blacklists. If a destination domain name exhibits suspicious activity or matches domains previously used by bad actors, ISPs will flag it. SystemeScale reserves the right to automatically block or suppress campaign deliveries containing dangerous domains to preserve shared IP reputation pools for all users.
Recommended optimization and reputation audit tools
Before launching a bulk marketing sequence, verify that your external landing paths are fully verified by running domain checks through these public databases:
- Verify URL Security Logs: Scan individual redirect links across comprehensive security search arrays using VirusTotal URL Database.
- Audit Domain Blocklist Placement: Check if your root custom domain asset or an affiliate landing domain resides on international security blocklists using MXToolbox Blacklist Checker.