Sendr generates a unique URL for each contact. Because every link is different, it does not trigger the pattern-matching filters that flag identical links sent to thousands of recipients — which is one of the main ways bulk email gets caught.

Dynamic GIFs

GIFs in emails can sometimes affect deliverability if used carelessly. A few things to keep in mind:

Keep GIF file sizes reasonable — large images slow load times and can be filtered
Do not make the GIF the only content in your email — include real text around it
Avoid GIFs in the very first email to a cold contact if your inbox is not yet warmed

General deliverability hygiene

The biggest factors in deliverability are domain reputation, DNS setup (SPF, DKIM, DMARC), sending volume, and list quality. A properly configured setup sending to verified, relevant contacts will perform well regardless of whether you include a Sendr link or GIF.

See "DNS setup for email deliverability: SPF, DKIM, and DMARC" and "My emails are going to spam: a troubleshooting guide" for more.

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