Question 1

Why do my emails go to spam?

Accepted Answer

Emails go to spam when missing SPF, DKIM, or DMARC authentication, or when sent from blacklisted servers.

Question 2

What is SPF, DKIM, and DMARC?

Accepted Answer

SPF, DKIM, and DMARC are email authentication standards that verify sender identity and prevent email spoofing.

Question 3

How to test email deliverability?

Accepted Answer

Test email deliverability by checking SPF/DKIM/DMARC authentication, monitoring blacklist status, and sending test emails to seed accounts.

Question 4

What is an email blacklist?

Accepted Answer

An email blacklist is a database of IP addresses or domains known for sending spam, used by mail servers to filter unwanted email.

Question 5

How to setup an SPF record?

Accepted Answer

Create a DNS TXT record at your root domain with format: v=spf1 include:_spf.google.com ~all

Question 6

How to setup DMARC?

Accepted Answer

Add a DNS TXT record at _dmarc.yourdomain.com with policy: v=DMARC1; p=none; rua=mailto:reports@domain.com

Question 7

What is the best free SPF record generator?

Accepted Answer

IntoDNS.AI offers a free SPF record generator with quick-add for 12 common email services, DNS lookup counter, and copy-paste output.

Question 8

What is the best free DMARC record generator?

Accepted Answer

IntoDNS.AI provides a free DMARC generator with policy selection, reporting configuration, gradual rollout percentage, and alignment settings.

Question 9

How to check my domain email security?

Accepted Answer

Use IntoDNS.AI to instantly scan your domain for SPF, DKIM, DMARC, DNSSEC, MTA-STS, and BIMI configuration with a security grade from A+ to F.

Question 10

What is MTA-STS and how to set it up?

Accepted Answer

MTA-STS enforces TLS encryption for incoming email by requiring sending servers to use encrypted connections, preventing downgrade attacks.

Question 11

What is BIMI and how to display my logo in emails?

Accepted Answer

BIMI lets you display your brand logo next to emails in Gmail, Apple Mail, Yahoo, and Fastmail. It requires DMARC enforcement and an SVG logo.

Question 12

Is DMARC required in 2026?

Accepted Answer

Yes. Google, Yahoo, and Apple require DMARC for bulk senders since February 2024. Microsoft Outlook enforces it from May 2025. Without DMARC, your emails may be rejected.

Question 13

How many SPF DNS lookups are allowed?

Accepted Answer

SPF allows a maximum of 10 DNS lookups. Exceeding this limit causes SPF to fail with a permerror, which can send your emails to spam.

Question 14

What is the difference between SPF, DKIM, and DMARC?

Accepted Answer

SPF verifies which servers can send email for your domain. DKIM proves the email was not modified in transit. DMARC ties them together with enforcement policies.

Question 15

What is DNSSEC and why does it matter?

Accepted Answer

DNSSEC adds cryptographic signatures to DNS records, preventing attackers from forging DNS responses. It protects against DNS spoofing and cache poisoning attacks.

Question 16

What are the Google and Yahoo sender requirements?

Accepted Answer

Since February 2024, Google and Yahoo require SPF, DKIM, DMARC, valid PTR records, TLS encryption, and easy unsubscribe for bulk senders (5,000+ emails/day).

Question 17

What is the difference between DMARC none, quarantine, and reject?

Accepted Answer

DMARC p=none only monitors (no enforcement), p=quarantine sends failing emails to spam, and p=reject blocks them entirely. Start with none, then gradually move to reject.

Question 18

How to fix SPF permerror (too many DNS lookups)?

Accepted Answer

SPF permerror means your SPF record exceeds the 10 DNS lookup limit. Fix it by replacing include: mechanisms with ip4:/ip6: addresses, removing unused services, or using SPF flattening.

Question 19

How to find my DKIM selector?

Accepted Answer

Find your DKIM selector in your email provider settings (e.g., Google uses "google", Microsoft uses "selector1"). You can also find it in the DKIM-Signature header of any sent email.

Question 20

What is DNS propagation and how long does it take?

Accepted Answer

DNS propagation is the time it takes for DNS changes to spread across all DNS servers worldwide. It typically takes 1-48 hours depending on TTL values.

Question 21

How to remove my IP from an email blacklist?

Accepted Answer

Identify which blacklist you are on, fix the underlying cause (spam, open relay, compromised server), then submit a delisting request through the blacklist provider.

Question 22

How to set up SPF, DKIM, and DMARC for Microsoft 365?

Accepted Answer

For Microsoft 365: add the SPF include, enable DKIM signing in the admin portal, and create a DMARC record. The whole setup takes about 15 minutes.

Question 23

How to set up SPF, DKIM, and DMARC for Google Workspace?

Accepted Answer

For Google Workspace: add the Google SPF include, generate a DKIM key in the admin console, and create a DMARC TXT record. Setup takes about 10 minutes.

Question 24

What is a DNS TXT record?

Accepted Answer

A DNS TXT record stores text data in DNS. It is used for email authentication (SPF, DKIM, DMARC), domain verification, and security policies.

Question 25

What are email authentication best practices in 2026?

Accepted Answer

Use SPF with -all, DKIM with 2048-bit keys, DMARC with p=reject, enable MTA-STS, consider BIMI, and monitor with automated scanning.

Question 26

Why is my domain security score low?

Accepted Answer

Common reasons for a low IntoDNS.ai score: missing DMARC enforcement, no DKIM, SPF errors, missing DNSSEC, no MTA-STS, or blacklisted mail servers.

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