I cannot send emails through Outlook.

Obtain Hartcom’s current SMTP settings and enter them separately on both devices; the same outgoing-server failure across desktop and phone points to the Hartcom mail service or its SMTP configuration rather than a single Outlook installation.

1. Ask Hartcom for the complete outgoing-mail settings

Request these specific values:

• SMTP host name
• SMTP port
• Encryption type: SSL/TLS, STARTTLS, or none
• Whether SMTP authentication is required
• SMTP username—often the complete email address
• Whether the normal password or an app-specific password is required
• Whether outgoing mail is restricted to Hartcom’s own internet connection
• Whether its outgoing server is currently operational

Do not substitute Outlook.com or Microsoft 365 server values: Hartcom hosts this mailbox, so Hartcom must provide the applicable server details. Microsoft identifies the SMTP host name, username, password, and SSL requirement as provider-supplied outgoing-mail settings.^1^

2. Update classic Outlook on the desktop

1. Close Outlook.
2. In the Windows search box, enter Control Panel and open it.
3. Search for and open Mail (Microsoft Outlook).
4. Select Email Accounts.
5. Select the Hartcom account, then Change.
6. Replace the Outgoing mail server (SMTP) value with the exact server name supplied by Hartcom.
7. Verify the username and password.
8. Select More Settings:
   • Under Outgoing Server, apply Hartcom’s authentication requirement. If Hartcom says to use the same credentials as incoming mail, select that option.
   • Under Advanced, enter Hartcom’s SMTP port and encryption type exactly.
9. Select OK and then Test Account Settings.

Two green check marks indicate that Outlook can connect successfully. Red markers mean the configuration or Hartcom connection is still failing; Microsoft directs users to verify those values with the email provider.^2^

Alternatively, inside classic Outlook, use File > Account Settings > Account Settings > Server Settings > Outgoing mail, enter the corrected values, and select Next > Done.^2^

3. Correct the phone’s outgoing-server entry

The exact menu depends on whether the phone uses the Outlook app, Apple Mail, or Android’s mail application. Open the Hartcom account’s advanced or server settings and update these fields:

• SMTP host name
• SMTP username
• SMTP password
• Port
• SSL/TLS setting
• Authentication, if shown

Use the Hartcom-provided values exactly. Automatic SMTP discovery does not always succeed for smaller providers; Microsoft’s documented action in that case is to obtain the SMTP details from the provider and enter them through advanced setup.^3^

After saving, send a new short message without an attachment. Existing messages in the Outbox may need to be opened and sent again.

4. Separate a Hartcom server problem from a device problem

Try sending a short message from Hartcom’s webmail site, if one is available:

• Webmail also cannot send: Hartcom needs to check the mailbox status, SMTP service, password/account lock, and any outage.
• Webmail sends, but both devices fail: give Hartcom the SMTP host, port, encryption, and authentication settings currently shown on each device. Ask them to identify which field differs from their required configuration.
• Desktop starts working but the phone does not: the remaining issue is the phone account configuration; update or remove and re-add only that phone account using Hartcom’s manual settings.

If classic Outlook displays Disconnected, Working Offline, or Trying to connect, select Send/Receive > Work Offline to return online and resend. If only one particular message remains stuck, remove any large attachment and retry.^4^

Do not remove or recreate the desktop Outlook profile until the SMTP test has been performed with confirmed Hartcom values. A new profile configured with the same incorrect or unavailable server will fail in the same way.

References

1. Server settings you'll need from your email provider | Microsoft Support
2. Change or update email account settings in Outlook for Windows | Microsoft Support
3. Error: SMTP Autodiscover Failed | Microsoft Support
4. I can't send or receive messages in Outlook | Microsoft Support