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Check the SPF (Sender Policy Framework) record for mastodon.social. SPF specifies which mail servers are authorized to send email on behalf of this domain.
SPF (Sender Policy Framework) is a DNS TXT record published at mastodon.social that lists the IP addresses and servers authorized to send email on behalf of the domain. When a receiving mail server gets an email claiming to be from mastodon.social, it checks the SPF record to verify the sending server is authorized. Without a valid SPF record, emails from mastodon.social are more likely to be marked as spam or rejected entirely. SPF is one of the three pillars of email authentication, alongside DKIM and DMARC.