// how to fix
Not sure what is wrong?How to fix email problems
Your test or scan found a problem? Find the matching guide below: what it means, why it matters, and how to fix it step by step.
Bounce 60
DNS 52
SPF 40
Reputation 39
DMARC 38
DKIM 34
Security 26
Gmail 21
Blacklist 18
Microsoft 365 17
Mailing list 16
Content 15
Mail server 13
Headers 12
Reverse DNS 12
SMTP 12
Spam score 12
Outlook 10
MX 9
Amazon SES 7
Google Workspace 5
TLS 5
Yahoo 5
Mailgun 4
Postmark 3
Apple 2
SendGrid 2
WordPress 2
Zoho 2
ARC 1
BIMI 1
Cloudflare 1
E-commerce 1
GMX 1
Resend 1
T-Online 1
2 guides · tag SendGrid
| Problem | In short | Tags | |
|---|---|---|---|
| SendGrid 403 "from address does not match a verified Sender Identity" | SendGrid rejects mail with 403 when the From address is not a verified sender or authenticated domain. Find the real From address and verify it properly. | Fix it | |
| SendGrid domain authentication CNAME records not verifying: fix | SendGrid says your em, s1._domainkey or s2._domainkey CNAME records are not valid? Fix doubled names, Cloudflare proxy, conflicts and propagation. | Fix it |
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