Email Fix Guides
Plain-English guides to setting up, checking and fixing your business email, written by Email Fix.
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Most common
My emails are going to spam
Work through the six most common causes and find out which one is affecting you.
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Getting started
I'm setting up or moving my email
How to get a professional address and set it up so your emails actually get delivered.
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Urgent
I think my email has been hacked
The warning signs, and exactly what to do first to lock it down and protect your customers.
What to do right now →
Getting set up
Getting a professional business email address, moving to a new provider, and checking everything works.
How to Set Up Professional Business Email: A Guide for Small Businesses
How to set up a professional business email address: Google Workspace vs Microsoft 365, what you need, and the setup steps that stop emails going to spam.
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How to Check Your Email Is Set Up Correctly (in 10 Minutes)
Check your business email is set up correctly in 10 minutes with free tools: SPF, DKIM and DMARC results, spam score, DNS records and blocklists.
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Switching Email Provider? How to Move Without Losing Emails
Switching email provider? A step-by-step guide to moving your business email to Google Workspace or Microsoft 365 without losing emails or going to spam.
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Email Security for Small Businesses: The Basics That Stop Most Attacks
Ten practical steps that protect a small business's email: two-step verification, forwarding checks, DMARC, invoice fraud rules and backups.
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Understanding how email works
The ideas behind email delivery, explained without the jargon.
What Is SPF, DKIM and DMARC? A Plain-English Guide for Business Owners
SPF, DKIM and DMARC explained in plain English: what each one does, why they decide whether your emails reach the inbox, and why setup needs care.
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Email Deliverability Explained: Why “It Sent” Doesn’t Mean “It Arrived”
Why "sent" doesn't mean "delivered": how emails silently land in spam, what it costs small businesses, and how to properly check your deliverability.
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Google, Yahoo and Microsoft Email Rules: What Small Businesses Need to Know
Gmail, Yahoo and Outlook now reject emails that break their rules. What the sender requirements mean for small businesses, and a simple checklist.
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How to Read Email Headers (and What They Tell You)
Find the hidden headers on any email and read the lines that show where it came from, why it was delayed and whether it passed SPF, DKIM and DMARC.
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What DMARC Reports Tell You (and How to Move from p=none to p=reject)
What DMARC reports show, how to read them without XML, and how to move safely from p=none to quarantine and reject.
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Can Someone Send Emails Pretending to Be Your Business?
Anyone can put your address on a fake email. How to tell if your business is protected, what DMARC does, and how to stop fake invoices in your name.
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Fixing problems
Emails going to spam, forms not sending, blacklists and hacked accounts.
Why Are My Emails Going to Spam? The Complete Diagnostic Checklist
Business emails going to spam? Work through my six-point checklist covering SPF, DKIM and DMARC, reputation, content, engagement and blocklists.
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Website Contact Form Not Sending Emails? Why It Happens and How to Fix It
Website contact form not sending emails? The six common causes, a quick test you can do yourself, and the fix that lasts, in plain English.
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Think Your Business Email Has Been Hacked? What to Do Right Now
Think your business email has been hacked? The warning signs, what to do first, how to protect customers from invoice fraud, and how to report it.
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Is Your Domain on an Email Blacklist? How to Check and Get Removed
Is your domain on an email blacklist? How to check for free, which listings matter, how to find the cause, and how to get removed for good.
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Emails to info@ Going Missing? Fixing Email Aliases After a Migration
Switched email provider and now emails to info@ or sales@ go missing? What goes wrong with aliases, groups and forwarding after a migration, and how to fix it.
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Plusnet Email Not Sending After the Move to Greenby? How to Fix ‘Unknown Sender’
Plusnet email stopped sending since the move to Greenby? What 'Unknown sender' and 'sender address invalid' mean, and how to fix each.
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Why Emails Bounce (and What the Bounce Message Is Telling You)
What 'undeliverable' messages mean. Common bounce codes such as 550 5.1.1 and 5.7.26 explained in plain English, with what to do about each.
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Emails Going to Spam After Moving to Microsoft 365 or Google Workspace?
Emails landing in spam since you moved to Microsoft 365 or Google Workspace? The six usual causes, starting with SPF and DKIM, and how to fix each.
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Virgin Media Email Moving to Junara? What to Do, and by When
Got an ntlworld, blueyonder, virgin.net or virginmedia.com address? Here is your deadline, your three options and the job to do first.
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Microsoft 365 Is Switching Off Basic SMTP Sign-In: What Will Stop Working?
Microsoft 365 switches off basic SMTP sign-in at the end of December 2026. Find what in your office will stop sending, and fix it first.
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Scanner Stopped Emailing? Fixing Scan-to-Email on Microsoft 365
Office scanner stopped sending scans by email through Microsoft 365? Why it happens, the four ways to fix it, and which suits your office.
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Email Stopped After Changing Nameservers? Which Records to Put Back
Changed nameservers and email stopped arriving? Which records to put back, where to find them, and what happened to email sent meanwhile.
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Domain Email Forwarded to Gmail or Yahoo? Why Some Emails Bounce
Your domain forwards to Gmail or Yahoo, and some senders' emails bounce? Why forwarding fails for some and not others, and how to fix it.
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Gmail No Longer Collects Your Business Email? Three Ways to Fix It
Gmail is ending "Check mail from other accounts". If your business email arrives in Gmail that way, here are three ways to keep it coming.
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Bounce messages explained
What the error in a bounced email means, and how to fix it.
550 5.7.26: Gmail Says the Sender Is Unauthenticated
Gmail bounced your email with 550 5.7.26? What it means, the usual causes (SPF, DKIM, DMARC, forwarding) and how to fix it yourself.
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550 5.7.515: Outlook.com Says Your Domain Doesn’t Meet the Authentication Level
Emails to Outlook.com or Hotmail bouncing with 550 5.7.515? What Microsoft's rule requires (SPF, DKIM, DMARC) and how to meet it.
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550 5.7.30: Basic Authentication Not Supported (Microsoft 365)
Scanner, website form or app stopped sending through Microsoft 365 with 550 5.7.30? What changes at the end of December 2026, and how to fix it.
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550 5.7.1: Unknown Sender, Relay Denied or Not Allowed to Send As
Email bounced with 550 5.7.1 "Unknown sender", "relay access denied" or "not allowed to send as"? What each means and how to fix it yourself.
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550 5.7.509: Microsoft Says Your Domain Failed DMARC
Email to an Outlook or Microsoft 365 address bounced with 550 5.7.509? Why your domain failed DMARC, the usual causes, and how to fix it.
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550 5.7.520: Microsoft 365 Says Your Organisation Doesn’t Allow External Forwarding
Got 550 5.7.520 "Your organization does not allow external forwarding"? Why Microsoft 365 blocks it, the safe way to allow it, and alternatives.
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