SMTP and IMAP
Connect an existing mailbox to Kurrier using standard SMTP and IMAP settings.
SMTP and IMAP
Kurrier can connect to an existing mail service using SMTP and IMAP:
- SMTP sends outgoing messages.
- IMAP synchronizes incoming mail and folders.
Use this provider when your mail host supplies standard server settings and credentials. You can configure SMTP only for sending, or SMTP with IMAP for a complete mailbox connection.
Before you begin
Collect the following information from your mail provider or administrator:
- Email address or account username
- App password or mailbox password
- SMTP host, port, and encryption mode
- IMAP host, port, and encryption mode
Prefer an app-specific password when your provider supports one. Some providers disable password-based SMTP or IMAP entirely and require their own OAuth integration instead.
Add the connection
- Open Settings → Providers.
- Select Add Provider → SMTP/IMAP.
- Enter a recognizable account label.
- Add the SMTP settings supplied by your provider.
- Add IMAP settings if you want Kurrier to synchronize the mailbox.
- Save and verify the connection.
Typical fields include:
| Field | Description |
|---|---|
| Account label | A private name used to identify the connection in Kurrier |
| SMTP host and port | The outgoing mail server and connection port |
| SMTP username and password | Credentials used to send mail |
| SMTP secure | Direct TLS, normally used with port 465 |
| IMAP host and port | The incoming mail server and connection port |
| IMAP username and password | Credentials used to synchronize mail |
| IMAP secure | TLS, normally enabled with port 993 |
Choose the correct encryption setting
The Secure setting describes how encryption begins:
| Connection | Typical port | Secure setting |
|---|---|---|
| SMTP with direct TLS | 465 | On |
| SMTP with STARTTLS | 587 | Off; the connection upgrades with STARTTLS |
| IMAP with TLS | 993 | On |
Use the values documented by your provider. Do not guess based only on the port if the provider gives explicit instructions.
Common configurations
Gmail with an app password
Google accounts using app passwords generally use:
| Setting | Value |
|---|---|
| SMTP host | smtp.gmail.com |
| SMTP port | 465 |
| SMTP secure | On |
| IMAP host | imap.gmail.com |
| IMAP port | 993 |
| IMAP secure | On |
Use the complete Gmail address as the username. The account must have two-step verification enabled before you can create an app password. Availability can depend on the Google account or organization policy.
Microsoft 365 or Outlook
Common server settings are:
| Setting | Value |
|---|---|
| SMTP host | smtp.office365.com |
| SMTP port | 587 |
| SMTP secure | Off; use STARTTLS |
| IMAP host | outlook.office365.com |
| IMAP port | 993 |
| IMAP secure | On |
Many Microsoft tenants disable basic username-and-password authentication. If yours does, use a supported Microsoft account integration or ask the tenant administrator which connection method is allowed.
Custom-domain mailbox
Your hosting provider may use values such as mail.example.com, SMTP port 465 or 587, and IMAP port 993. Use the exact values in the provider's control panel or documentation.
Accounts, identities, and mailboxes
Kurrier keeps these concepts separate:
- The account contains the encrypted server connection and credentials.
- The identity contains the address and display name used when sending.
- The mailboxes are the folders discovered from the IMAP server.
After a successful SMTP/IMAP connection, Kurrier creates or links the appropriate identity and starts discovering folders. Initial synchronization can take longer for a large mailbox.
Troubleshooting
| Problem | What to check |
|---|---|
| Invalid login or password | Confirm the complete username and use an app password when required. |
| Connection refused | Check the host, port, firewall rules at the provider, and encryption mode. |
| TLS or hostname error | Use the provider's documented server hostname rather than a custom alias. |
| SMTP works but IMAP fails | Confirm that IMAP is enabled for the account and that its credentials are correct. |
SMTP authentication fails on port 587 | Use STARTTLS with SMTP secure off unless the provider explicitly says otherwise. |
| Mailbox connects but messages are missing | Allow the initial synchronization to run and confirm that the expected IMAP folders are available. |
Security recommendations
- Use app-specific credentials where available.
- Keep TLS enabled according to your provider's instructions.
- Do not reuse an administrator or root mailbox credential.
- Rotate a credential immediately if it may have been exposed.
- Never include mailbox passwords in a support request.
You can connect multiple SMTP/IMAP accounts when your workspace needs more than one mailbox or provider.