After an email migration, Outlook or a mobile mail app may keep trying to connect with old server details, cached passwords, or an outdated mailbox profile. In most cases, the mailbox itself is working, but the app needs to be reconnected with the correct settings from the new hosting platform or control panel. This guide explains how to reconnect email in Outlook or on mobile after migration, how to verify the correct server settings, and what to do if sending or receiving still fails.
Why email stops working after migration
When a mailbox is moved to a new hosting environment, the email address usually remains the same, but one or more of the following may change:
- Incoming and outgoing mail server names
- Mail protocol used by the app, such as IMAP or POP
- Encryption settings such as SSL/TLS
- Saved passwords in Outlook or on the phone
- Autodiscover or automatic setup records in DNS
- Mailbox profile data stored locally in the app
Outlook and mobile mail clients often keep old connection data even after the migration is complete. If the app is still pointing to the previous server, it may show repeated password prompts, send mail only intermittently, or stop syncing folders.
Before you reconnect email
Before changing anything in Outlook or on your mobile device, confirm the current mailbox details in your hosting control panel or migration notes. In a managed hosting environment, the following information is typically required:
- Email address and password for the mailbox
- Incoming server name
- Outgoing SMTP server name
- Port numbers for IMAP, POP, and SMTP
- Encryption method, usually SSL/TLS or STARTTLS
- Username format, usually the full email address
If your provider uses Plesk, open the mail account settings in the control panel and compare them with the details currently saved in Outlook or on the phone. If the mailbox was migrated to a different server, the DNS records may also need to be updated so that mail apps can resolve the new endpoints correctly.
How to check the correct email settings after migration
Use the migration documentation or the hosting control panel to verify the exact values. If you do not have them, your hosting provider can usually confirm the current configuration. In many EU hosting setups, IMAP is preferred because it keeps mail synchronized across devices.
Typical settings to verify
- Incoming server: IMAP or POP host name
- Outgoing server: SMTP host name
- IMAP port: usually 993 with SSL/TLS
- POP port: usually 995 with SSL/TLS
- SMTP port: usually 465 with SSL/TLS or 587 with STARTTLS
- Authentication: enabled for outgoing mail
- Username: full mailbox address
Common signs the settings are wrong
- Mail receives but does not send
- Mail sends but does not receive
- Repeated password pop-ups
- “Cannot connect to server” or “Server not found” errors
- Outlook keeps asking to repair the account
- The app shows old folders or no new messages
How to reconnect email in Outlook after migration
For Outlook, the most reliable fix is often to create a new profile or remove the old account and add it again with the new server settings. This prevents Outlook from reusing cached migration data.
Option 1: Re-enter the account settings in Outlook
- Open Outlook.
- Go to File > Account Settings > Account Settings.
- Select the email account that stopped working.
- Click Change.
- Update the incoming and outgoing server details with the values from your hosting control panel.
- Check the username and password.
- Open More Settings and confirm authentication for the outgoing server.
- Save the changes and test the account.
Option 2: Remove and add the account again
If Outlook still connects to the wrong mailbox or shows sync errors, remove the account and add it back using manual setup.
- In Outlook, open Account Settings.
- Select the broken account and remove it.
- Close Outlook completely.
- Reopen Outlook and add the mailbox again.
- Choose manual setup if auto-configuration does not detect the new server correctly.
- Enter the IMAP or POP settings supplied by your hosting provider.
Option 3: Create a new Outlook profile
If the profile is damaged, creating a new one is often the fastest solution after a migration.
- Close Outlook.
- Open the Windows Control Panel and search for Mail.
- Choose Show Profiles.
- Create a new profile.
- Add the mailbox using the correct server and authentication details.
- Set the new profile as default if the account works correctly.
This method is especially useful when Outlook has stored old Autodiscover results, cached credentials, or partial migration data.
Option 4: Clear saved credentials
If Outlook keeps asking for a password, Windows may still be storing outdated login data.
- Open Credential Manager in Windows.
- Go to Windows Credentials.
- Remove entries related to the email account, mail server, or Outlook.
- Restart Outlook and enter the mailbox password again.
How to reconnect email on iPhone after migration
On iPhone, the Mail app often keeps old server details until the account is removed and added again. If the mailbox was migrated to a new hosting platform, this is usually the cleanest fix.
Remove and add the account again
- Open Settings.
- Go to Mail > Accounts.
- Select the email account.
- Tap Delete Account.
- Add the account again using Add Account > Other if needed.
- Enter the email address, password, and the new server settings manually if prompted.
Check sync and mailbox options
After reconnecting, make sure Mail sync is enabled for the correct mailbox and that the account is set to fetch or push mail as required by your provider. If messages still do not arrive, verify that IMAP is active in the control panel and that the device is using the right port and encryption.
How to reconnect email on Android after migration
Android devices use different mail apps, but the troubleshooting process is similar. If the app cannot connect after migration, remove the old account and add it again with the updated host name and ports.
Remove the account from the app
- Open the email app.
- Go to account or app settings.
- Select the mailbox that no longer works.
- Remove or delete the account from the app.
Add it again with manual settings
- Open the app and choose to add a new account.
- Enter the full email address and password.
- If automatic setup fails, select manual setup.
- Choose IMAP if you want mail synchronized across devices.
- Enter the incoming and outgoing server details from the hosting control panel.
- Confirm SSL/TLS or STARTTLS settings.
Check battery and sync restrictions
Some Android devices limit background sync after account changes. If the mailbox appears connected but messages do not arrive, make sure the app is allowed to sync in the background and is not restricted by battery optimization settings.
How to reconnect email in Thunderbird and other desktop clients
While this guide focuses on Outlook and mobile, the same principles apply to Thunderbird, Apple Mail, and similar clients. If the account was migrated, remove the old server information and add the mailbox again with the correct IMAP or SMTP settings. Desktop clients are often more forgiving than Outlook, but they still depend on accurate DNS, authentication, and encryption settings.
How DNS and Autodiscover can affect email reconnecting
After a migration, DNS records may continue pointing to the previous system. This can prevent automatic configuration from finding the new mailbox host. In hosting environments that support Autodiscover, the following records should be checked:
- MX record for inbound mail delivery
- Autodiscover record for automatic configuration
- SPF record for mail authentication
- DKIM record for signed outbound messages
- DMARC record for policy and reporting
If Outlook or a mobile app keeps reconnecting to the old location, the DNS records may still be cached or not updated. In that case, allow time for DNS propagation, then restart the device and try again. For business email accounts in Europe, it is important that mail authentication is correct so messages do not end up in spam or fail delivery after the migration.
Troubleshooting if email still will not reconnect
If the mailbox does not work after re-entering the settings, use this checklist.
1. Confirm the password
Make sure the mailbox password is correct. If the password was changed during migration, update it in the app and in any saved credential store.
2. Verify the server names
Do not reuse the old mail server host names unless your hosting provider confirmed they still apply. Even one incorrect character can stop the connection.
3. Check port and encryption
Using the wrong port or encryption method is one of the most common causes of failure. For example, an IMAP account set to port 143 without the correct encryption may be blocked by the server.
4. Make sure SMTP authentication is enabled
Sending mail usually requires authentication. If this is disabled, outgoing messages may fail even though incoming mail works.
5. Remove cached profiles or credentials
Outlook and some mobile apps store old login data. Deleting the saved account and re-adding it often fixes this.
6. Check mailbox status in the control panel
In Plesk or another managed hosting panel, confirm that the mailbox exists, is active, and has sufficient storage space. A full mailbox can stop new mail from being delivered.
7. Test webmail access
If webmail works but the app does not, the issue is usually local to the device or app configuration. If webmail also fails, the issue is more likely related to the mailbox or server configuration.
Best practice for migrated business email accounts
For business email accounts, IMAP is usually the best choice because it keeps folders and messages synchronized across Outlook, phone, and webmail. POP may still work, but it can create confusion after a migration because messages are stored locally on each device. If several team members use the same mailbox or shared access patterns, confirm the expected protocol before reconnecting the account.
It is also a good idea to:
- Keep a copy of the old and new settings during migration
- Update all devices one by one and test each connection
- Verify SPF, DKIM, and DMARC after the mailbox is moved
- Check that the mailbox name matches the new hosting configuration exactly
- Restart Outlook or the phone after saving the new settings
Frequently asked questions
Why does Outlook keep asking for a password after migration?
Outlook is usually trying to use cached credentials, an old profile, or an outdated server name. Remove the saved credentials, verify the current mailbox password, and reconnect the account with the new settings.
Should I delete the account or just change the server name?
If only the server name changed and the profile is otherwise healthy, updating the settings may be enough. If Outlook continues to fail, delete the account or create a new profile to avoid using old cached data.
Do I need IMAP or POP after migration?
For most business users, IMAP is the better option because it keeps mail synchronized on all devices. POP may be suitable if you only use one device and want mail downloaded locally, but it is less flexible after migration.
Why can I receive email but not send it?
This usually means SMTP authentication, port, or encryption settings are wrong. Check the outgoing server details in your hosting control panel and confirm that authentication is enabled.
How long should I wait after changing DNS?
DNS propagation may take time depending on the TTL and caching. Some devices update quickly, while others may keep old data longer. Restart the app and device after the DNS change, then test again.
What if webmail works but Outlook does not?
If webmail works, the mailbox itself is available. The problem is likely in the Outlook profile, saved credentials, or local account settings. Recreate the profile or add the account again manually.
Can I keep the same email address after migration?
Yes. In most hosting migrations, the email address stays the same, but the connection details may change. The app needs to be reconfigured to point to the new mailbox location.
Summary of the fastest fix
If you need the shortest path to a working mailbox after migration, use this sequence:
- Confirm the new server settings in the hosting control panel.
- Remove the email account from Outlook or the mobile app.
- Clear cached credentials if needed.
- Add the account again using IMAP and the correct SMTP settings.
- Test sending and receiving.
- Check DNS records if auto-setup still points to the old location.
In most cases, this resolves post-migration email problems without requiring deeper server changes. If the mailbox still fails to connect, the issue is usually related to incorrect host names, authentication, or a DNS record that has not yet been updated.
Once the account is reconnected successfully, keep the new settings in a safe place. That makes future changes easier and reduces downtime if another migration or mail platform update is needed.