Web.de is a search engine and email provider, headquartered in Germany. Eurproean receivers tend to have high expectations for GDPR legal complaince, and in some cases email deliverability is aided when the sender is included in high profile "whitelists" and certification programs.
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smtp;550 <firstname.lastname@example.org>: Reject due to SPF policy. The originating IP of the message is not permitted by the domain owner
smtp;550 <email@example.com>: Requested mail action aborted: exceeded storage allocation, Quota exceeded