Topic
SPF
Practical guides tagged SPF, collected from the Zeqo blog.
DeliverabilityDKIM
Microsoft 365 Email Authentication: SPF, DKIM & DMARC Setup Guide
Microsoft 365 doesn't sign with DKIM properly until you enable it per domain — and the CNAME setup trips almost everyone. Here's the full sequence.
8 min read
DeliverabilitySPF
Can You Have Two SPF Records? (No — and Here's How to Merge Them)
Adding a second SPF record doesn't add senders — it invalidates both. Here's the rule, and the correct way to merge.
5 min read
DeliverabilitySPF
SPF Record Syntax Explained: Includes, IPs, and the 10-Lookup Limit
SPF looks like one TXT record, but includes, redirects, and the 10-lookup limit can quietly break all your mail. Here's how to read it correctly.
8 min read