Guides: your email and your domain, step by step

Each guide says what to do, in order, with the values to copy, and ends with a free check so you can confirm it worked.

• DMARC, SPF and DKIM on Wix, step by step

  How to add SPF, DKIM and DMARC to a domain on Wix, with the values for Google Workspace and Microsoft 365, and how to confirm it worked. Of 500 Wix sites we checked, 4 in 10 had no DMARC.

• Shopify store emails going to spam, or sent from shopifyemail.com

  Why Shopify replaces your store's sender with a shopifyemail.com address, how to authenticate your domain and add DMARC, and when to move from p=none to p=quarantine.

• DKIM in Google Workspace: sign your emails with your own domain

  Half of the domains with email on Google Workspace have no DKIM. How to generate the key in the Admin console, where to put the TXT record, how to start authentication and check in Gmail that it works.

• DKIM in Microsoft 365: sign your emails with your own domain

  More than a third of domains with email on Microsoft 365 have no DKIM. Where to turn it on in Microsoft Defender, the two CNAME records to create, and how to check your emails now go out signed.

• Two SPF records or more than 10 lookups: the SPF that looks fine and doesn't work

  A domain can only have one SPF record, and SPF can only make 10 DNS lookups. How to merge two records into one, how to cut down the lookups, and how to confirm it. We saw this on 1 in 17 sites.

• DMARC: moving from p=none to p=quarantine without losing email

  p=none only watches: it doesn't stop fake email. How to confirm all your genuine email passes, how to switch to p=quarantine without losing email, and what to do if something fails.

• Email bounced with “550 5.7.26”: what Gmail is telling you

  Did Gmail bounce your email with error 550 5.7.26? There are three different messages behind this code. How to tell which one you got, what causes it and how to fix it in your domain.

• Is this online shop legit? 7 checks before you pay

  How to tell whether an online shop is real before you buy: the domain's age, who the seller is, reviews outside the site, the photos, returns and how you pay. And what to do if you already bought.

• The critical PHP flaw of October 2026: is my website affected?

  On 21 October 2026 PHP fixed two critical flaws. How to tell whether your site runs PHP, which version you have, what to ask your host and what to do after updating.