Topic
How-To
Practical guides tagged How-To, collected from the Zeqo blog.
ERR_CERT_DATE_INVALID: The Fix When It's Your Site
If your own visitors are hitting NET::ERR_CERT_DATE_INVALID, the advice to check your system clock does not apply to you. Your certificate expired. Here is the fix, and the prevention.
Brevo Emails Going to Spam? The Deliverability Fix Order
Brevo campaigns in the spam folder usually trace back to an unauthenticated domain or a shared IP pool. Here is how to tell which, and what to fix first.
WooCommerce Emails Going to Spam? Stop Sending Through PHP Mail
WooCommerce order emails land in spam because WordPress sends them through the server's PHP mail function with no authentication. Here is what to replace it with.
Mailchimp Emails Going to Spam? Fix Authentication First
Mailchimp campaigns going to spam are usually an authentication or reputation problem, not a content one. Here is the order to check things in, and what to fix first.
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.
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.
Spamhaus Blacklist: How to Check, Understand, and Get Delisted
Spamhaus is the blocklist that actually matters. The delisting process is free and fast — if you fix the cause first.
Klaviyo Deliverability: Sending Domain Setup and Why Emails Go to Spam
Klaviyo's default shared sending domain means you inherit other senders' reputation. Here's the correct setup and the usual culprits behind spam placement.
What Is My DKIM Selector? How to Find It (Provider Lookup Table)
Your DKIM selector is the prefix in the DNS lookup — and most providers use a predictable default. Here's the table, and how to find yours if it isn't listed.