Shortened links are often flagged by spam filters in email signatures because they obscure the true destination of a URL, making it easier for spammers to hide malicious or suspicious sites.
Spam filters, aiming to protect users, treat these hidden links as potential threats and frequently block emails containing them.
Why Spam Filters Flag Shortened Links
Spam and phishing attacks commonly use URL shorteners to disguise URL destinations.
Since the actual website behind a short link is concealed, spam filters can’t easily verify its safety.
This lack of transparency makes short links a favorite tool for attackers to distribute malware, phishing pages, or blacklisted content.
As a result, many filters automatically flag or block emails containing popular shortener domains like bit.ly or tinyurl, even if the sender’s intent is legitimate.
How This Impacts Email Signatures
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Obscured Destinations: Recipients and filters can’t see where the link leads, increasing suspicion.
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Abuse by Spammers: Shortened links are frequently used in spam campaigns, causing many shortener domains to end up on blocklists.
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False Positives: Even legitimate emails can be marked as spam if they contain too many shortened or redirecting links.
For example, if your signature includes a bit.ly link to your company’s homepage, spam filters may flag your entire email, reducing deliverability and harming your professional reputation.
A tip for you: Use VirusTotal to check the the link shortener’s domain reputation and if they are already flagged/blocked/banned by popular security services.
Best Practices to Avoid Being Flagged
To keep your emails out of spam folders:
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Use Safe, Popular Link Shorteners: Choose a reputable, privacy-friendly service that maintains a clean reputation and is less likely to be abused by spammers.
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Shorten with Branded Domains: Create short links using your own domain (e.g.,
go.yourbrand.com/sale) instead of generic shorteners.- Branded links look more trustworthy and help your emails pass spam checks, while also keeping your brand front and center.
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Test Your Emails: Before sending, check your emails with common providers (like Gmail or Outlook) and run them through spam testing tools to ensure deliverability.
Why Linko is a Smart Choice
Linko stands out as a safe, secure, and popular link shortener that supports custom branded domains for shortening.
With Linko, you can:
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Shorten URLs using safe, unblacklisted domains.
Check out what domains does Linko provide for link shortening.
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Create branded short links that reinforce your brand identity and trust.
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Access privacy-friendly and secure link management features, reducing the risk of spam flagging.
In summary
Avoid generic short links in your email signature.
Use a reputable platform like Linko, and always opt for branded domains to maximize trust, deliverability, and brand visibility.