How to test email deliverability for your own website

"Deliverability" means your mail reaching the recipient's inbox, not just leaving your server. Mail can be sent successfully and still land in spam, or be silently dropped. This guide shows how to test your own domain's mail properly, read the results, and fix the usual causes, whether you send from a mailbox on Domain India hosting, from a website contact form, or from Business Email.

1. What decides whether mail reaches the inbox

Receiving servers such as Gmail and Outlook ask three questions about every message:

Gmail and Yahoo now require bulk senders to have SPF, DKIM and DMARC in place and to offer one-click unsubscribe, and every large provider treats unauthenticated mail with suspicion. Authentication is the part you control completely, so test it first.

2. Test with a scoring service

A scoring service gives you an address to send to and then grades the message it receives.

MXToolbox is useful alongside it: its SuperTool looks up your SPF, DKIM and DMARC records and checks an IP address against many blocklists. Paid services such as GlockApps test inbox placement across many providers at once, which helps if you send newsletters regularly.

3. Test with real mailboxes and read the headers

Scores are a guide; real inboxes are the proof. Send the same message to a Gmail address and an Outlook.com address you own, then:

• Check where it landed: Inbox, Promotions, or Spam/Junk.
• Read the authentication results. In Gmail, open the message, click the three-dot menu and choose Show original. The top of the page shows SPF, DKIM and DMARC with PASS or FAIL. In Outlook.com, open the message's source or headers and look for the Authentication-Results line.

4. Check your DNS records

On cPanel, open Email › Email Deliverability. It lists each domain, says whether SPF and DKIM are valid, and shows the exact records to add if they are missing or wrong. If your domain's DNS is managed at our hosting nameservers, it can install them for you; if your DNS is elsewhere (for example Cloudflare), copy the records into that DNS provider.

On DirectAdmin, DKIM uses the selector x, so the record is x._domainkey.yourdomain.com, and most domains already have a key. See how to check and manage DKIM in DirectAdmin.

On Business Email, DKIM signing is on for every message, and the SPF and DMARC records to publish are provided for your domain.

Add a DMARC record at _dmarc.yourdomain.com once SPF and DKIM pass. Start with monitoring only, v=DMARC1; p=none; rua=mailto:[email protected], read the reports for a few weeks, then move to p=quarantine. The full walkthrough is in SPF, DKIM and DMARC and setting up DMARC.

5. Test your website's contact form too

Mail sent by your website follows a different path from mail sent by your email app, so test it separately. Common problems:

• The From address is a visitor's Gmail address. Your server is not allowed to send as gmail.com, so DMARC fails. Send from an address on your own domain and put the visitor's address in Reply-To.
• The envelope sender is the server's default user. On cPanel, use PHP mail() with the -f option so the envelope sender is your own address. SMTP from PHP does not work on our cPanel servers because the socket functions it needs are disabled. See PHP mail settings and PHPMailer for contact forms.
• WordPress forms often use the same settings; check the plugin's "From" field.

Send a test submission to mail-tester.com and to your own Gmail, and read the headers as in section 3.

6. Check blocklists and reputation

If authentication passes and mail still goes to spam or bounces, check the sending IP address against blocklists with MXToolbox's blacklist check. The IP is in the Received headers of a message you sent, or ask support.

On shared hosting, the sending IP is shared by the server. You can't request delisting of a shared server IP yourself; if a test shows it listed, open a ticket with the report and we will look at it. Your domain's own reputation is yours: for Gmail, Google Postmaster Tools shows spam rates and authentication for domains that send enough mail. See what to do if your email is blacklisted.

7. Content and sending habits

• Write like a person. Avoid all-caps subjects, rows of exclamation marks, and messages that are one big image.
• Link carefully. Link only to your own domain or well-known sites, and never use link shorteners in business mail.
• Send to people who expect it. Mail to old or bought lists produces bounces and spam complaints, which damage reputation faster than anything else.
• Stay within limits. Shared hosting is not for bulk mail: outgoing mail is limited to 200 messages per hour per account on cPanel and 1,000 per day on DirectAdmin. Use a newsletter service for campaigns and include it in your SPF record. See do you limit the amount of mail I can send.

8. A simple routine

Test after every DNS change, after adding any service that sends as your domain, after moving hosting, and once every few months anyway. Keep the mail-tester result and the Gmail headers from a good test, so you can compare when something changes.

9. Where Domain India fits

Every Domain India shared hosting plan includes mailboxes on your domain. On cPanel, the Email Deliverability tool checks SPF and DKIM for you. Business Email signs every message with DKIM and provides the SPF and DMARC records for your domain, which suits businesses that want mail separate from their website hosting:

Support is on 24/7 live chat, and tickets get a first response within 15 minutes; resolution can take longer depending on the issue. There is no phone support.

Ready to test? Start with SPF, DKIM and DMARC, fix spam placement with email going to spam, or open a support ticket with your test report if something still fails.