Introduction #

In shared hosting environments, Outlook sync problems are common—especially after changing hosting, changing DNS, or switching between POP3 and IMAP.
The fastest way to confirm the mailbox is fine is to log in to webmail first:
https://yourdomain.com/webmail.
If webmail shows the correct emails, the issue is almost always Outlook configuration, local Outlook mode, or DNS routing.

Essential synchronization concepts (IMAP vs POP3) #

IMAP (recommended for Outlook sync) #

• IMAP keeps email synchronized between the server (webmail) and Outlook.
• Folders and read/unread status stay consistent across devices.

POP3 (not recommended if you want true sync) #

• POP3 commonly downloads messages and may remove them from the server.
• This can create “emails are in Outlook but not webmail” or “emails are in webmail but not Outlook” confusion.

Step-by-step: correct Outlook email setup (IMAP) #

Step 1: Get the correct mail settings from cPanel #

1. Log in to cPanel.
2. Go to Email → Email Accounts.
3. Find your mailbox and click Connect Devices or Set Up Mail Client.
4. Copy the recommended IMAP/SMTP server names, ports, and security options.

Typical secure settings (most common) #

Step 2: Add the account in Outlook (manual setup) #

1. Open Outlook → go to File → Add Account.
2. Select Manual setup (or “additional server types”).
3. Choose IMAP (or “POP or IMAP” and then select IMAP).
4. Enter the settings exactly as shown in cPanel.
5. Open More Settings → Outgoing Server tab:
6. Check My outgoing server (SMTP) requires authentication.
7. Select Use same settings as my incoming mail server.
8. On the Advanced tab, confirm ports + encryption match the IMAP/SMTP values above.
9. Save and let Outlook run the connection test.

Common Outlook sync issues & solutions #

1) Emails appear in webmail but not Outlook #

• Wrong protocol: Outlook is configured as POP3 instead of IMAP → remove account and re-add as IMAP.
• Offline mode: Outlook in “Work Offline” → Outlook ribbon Send/Receive → disable Work Offline.
• Outdated settings: verify server names, ports, encryption, and username is the full email address.

2) Outlook not sending or receiving emails #

• SMTP authentication is off: enable “My outgoing server requires authentication”.
• Password mismatch: reset the mailbox password in cPanel and update it in Outlook.
• Local security software blocks ports: temporarily test with firewall/antivirus disabled (ports 993/465/587).

3) Sync issues after hosting migration #

1. Confirm MX records: your domain must route email to the current mail server.
2. Allow DNS propagation: after changing DNS/MX, some networks still cache old values for hours.
3. Remove + re-add the account: once MX is correct, rebuild Outlook’s connection using the latest settings.
4. Missing emails: migrate mail from the old server using an IMAP migration method (IMAP sync) if required.

4) SSL certificate warnings in Outlook #

• Use the server hostname for both IMAP and SMTP (from cPanel/welcome email).
• Confirm SSL/TLS ports are correct: IMAP 993, SMTP 465 (or STARTTLS 587).
• If the hostname matches what you expect, accept the certificate prompt.

General troubleshooting checklist #

• Test webmail first: confirm emails exist on the server via /webmail.
• Confirm IMAP: IMAP is best for fixing Outlook email synchronization issues.
• Update Outlook: install updates and restart after changes.
• Check mailbox quota: if over quota, sync can stall and new mail may fail.
• Restart Outlook profile: if Outlook still misbehaves, remove and re-add the account (fresh profile = fresh sync).
• Check DNS externally: confirm MX records using a reputable checker.

Useful tools & where to find your settings #

Inside cPanel #

• Email Accounts: view mailboxes, reset passwords, open “Connect Devices / Set Up Mail Client”.
• Email Deliverability: validate SPF/DKIM (deliverability impacts “mail rejected” scenarios).
• Zone Editor: verify MX records and DNS entries.

External tools #

• MXToolbox (MX/DNS verification)

Recommended internal Hosticko links (update URLs to your knowledgebase):
Connecting an Email Client to a Mailbox,
How to Obtain Email Headers,
Understanding SPF Records for Email Deliverability.

When to contact Hosticko Support #

If you’ve followed the steps and still have Outlook email synchronization issues, open a ticket and include:

• Your domain + affected email address(es)
• What works and what doesn’t (webmail OK? Outlook send fails? sync only one folder?)
• Exact Outlook error message (copy/paste)
• Screenshots of your Outlook IMAP/SMTP settings
• Whether you recently migrated hosting or changed DNS/MX

Open a Hosticko Support Ticket

FAQs #

Why do emails show in webmail but not in Outlook? #

Usually because Outlook is configured as POP3, Outlook is in Work Offline mode, or IMAP/SMTP settings (ports/encryption/username) are incorrect.
Webmail proves the mailbox exists on the server—so the fix is almost always Outlook configuration.

What settings should I use to fix Outlook email synchronization issues? #

Use IMAP with SSL/TLS: IMAP 993 and SMTP 465 (SSL/TLS) or SMTP 587 (STARTTLS), and enable SMTP authentication using the same login as incoming mail.

After migration, how long does it take for Outlook to sync correctly? #

Once MX records are correct and DNS caches update, Outlook typically syncs quickly. If it still shows old behavior, remove and re-add the account so Outlook rebuilds the connection.