Feature Request: Domain referral exclusion/aliasing

[ordehi]

Feature request

Is your feature request related to a problem?

We've encountered an attribution challenge in scenarios where our users are redirected to external authentication providers (e.g., accounts.google.com) during the signup process. Currently, PostHog overrides the initial referrer with these authentication domains, causing incorrect attribution.

Describe the solution you'd like

Would it be possible to add a domain referral exclusion feature, similar to GA4's referral exclusion list? This would enable us to specify domains that should not overwrite the initial referrer, thus maintaining accurate attribution for user signups.

Describe alternatives you've considered

Using UTM parameters to track sources, but that doesn't help with initial referrer.

Additional context

From: https://posthoghelp.zendesk.com/agent/tickets/26417

Debug info

Kind: support

Target area: analytics

Report event: http://go/ticketByUUID/3246b212-d9a6-495b-933d-cd2a6da18cb3

Session: https://us.posthog.com/project/sTMFPsFhdP1Ssg/replay/01956081-d968-7078-acf4-4c436e1b5202?t=1010

Exceptions: https://us.posthog.com/project/2/error_tracking?filterGroup=%7B%22type%22%3A%22AND%22%2C%22values%22%3A%5B%7B%22type%22%3A%22AND%22%2C%22values%22%3A%5B%7B%22key%22%3A%22%24session_id%22%2C%22value%22%3A%5B%2201956081-d968-7078-acf4-4c436e1b5202%22%5D%2C%22operator%22%3A%22exact%22%2C%22type%22%3A%22event%22%7D%5D%7D%5D%7D

Location: https://eu.posthog.com/project/13839/settings/project-product-analytics

Sentry: http://go/sentryEU/13839

Persons-on-events mode for project: person_id_override_properties_joined