Emails routed to external recipients' spam

We've corrected an SPF record issue and investigated several potential causes, including Yahoo/AOL filtering changes, Microsoft-related redirect links in email signatures, and messages being flagged as spam by our email security platform.

Internal delivery issues appear to be resolved, and complaint volume has decreased, but we still occasionally hear from external recipients who aren't receiving emails. We currently monitor reports, follow up on unanswered emails, and help clients whitelist our domain when needed, but that isn't a scalable long-term solution.

Has anyone dealt with a similar situation? What strategies, tools, or best practices have helped you identify and resolve intermittent email deliverability issues without requiring users to verify every message?

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Emails routed to external recipients' spam