IMAP & SMTP Settings for All Clients
This guide explains Reference for all standard IMAP/SMTP hosts, ports, and encryption. so you can complete the TrekMail task with confidence.
Article details
Type, difficulty, plans, and last updated info.
▼
Article details
Type, difficulty, plans, and last updated info.
- Type
- Guide
- Difficulty
- Beginner
- Plans
- Nano · Starter · Pro · Agency
- Last updated
- Apr 29, 2026
Use these settings to connect TrekMail to any email app (Outlook, Apple Mail, Thunderbird, etc.).
Who this is for
- Users configuring a desktop or mobile email client.
- Developers configuring a script to send email.
1. Incoming Mail (IMAP)
Use these settings to receive email.
| Setting | Value |
|---|---|
| Server Hostname | imap.trekmail.net |
| Port | 993 |
| Encryption/Security | SSL or SSL/TLS |
| Username | Your full email address (e.g., alice@example.com) |
| Password | Your mailbox password |
Note: We do not support POP3 (which deletes mail from the server). Please use IMAP to keep your email synced across devices.
2. Outgoing Mail (SMTP)
Use these settings to send email.
| Setting | Value |
|---|---|
| Server Hostname | smtp.trekmail.net |
| Port | 465 (Recommended) or 587 |
| Encryption | SSL/TLS (for 465) or STARTTLS (for 587) |
| Username | Your full email address |
| Password | Your mailbox password |
| Authentication | Required ("Password" or "Normal") |
IMAP Connection Limits
To ensure fair resource usage and server stability, TrekMail enforces concurrent IMAP connection limits based on your subscription plan.
| Plan | Connections per IP | Total Connections |
|---|---|---|
| Nano | 10 | 15 |
| Starter | 25 | 40 |
| Pro | 50 | 80 |
| Agency | 100 | 150 |
- Per IP: Maximum simultaneous connections from a single IP address (e.g., your home network).
- Total: Maximum simultaneous connections across all devices and locations.
What happens if I exceed the limit?
Your email client will receive a "Maximum connections exceeded" error and won't be able to establish new IMAP connections until existing ones are closed.
Tips to avoid connection limits
- Close unused email clients: If you have multiple devices, close email apps you're not actively using.
- Check client settings: Some email clients open excessive connections. Configure them to use fewer simultaneous connections.
- Upgrade if needed: If you regularly hit the limit with normal usage, consider upgrading to a higher plan.
CalDAV / CardDAV (calendar and contacts)
In addition to IMAP/SMTP for mail, TrekMail exposes calendar and contacts over CalDAV/CardDAV. This is what your phone or desktop calendar app uses to sync events and contacts.
| Setting | Value |
|---|---|
| Server / Base URL | https://trekmail.net/dav/ |
| Discovery | Auto-detected by Apple Calendar, iOS, Android (DAVx⁵), Thunderbird via .well-known/caldav and .well-known/carddav |
| Username | Full email address (e.g. alice@yourdomain.com) |
| Password | Same mailbox password used for IMAP and SMTP |
| Encryption | HTTPS — required, no plain HTTP |
| Authentication | HTTP Basic |
For platform-specific guides see: Apple · iPhone/iPad · Android · Thunderbird · Outlook (caveats).
Important Notes
- Username: Always use the full email address. Just
alicewill fail. - Passwords: Use the specific mailbox password you set when creating the user, not your TrekMail account password.
- App Passwords: We do not require specific "App Passwords". Use your standard mailbox password.
- Nano Plan Sending: If you are on the Nano plan, you must configure "Bring Your Own SMTP" in the dashboard for outbound mail to work, OR use your external provider's SMTP settings directly in your client (e.g., SendGrid's SMTP).
Related articles
Jump to nearby guides that continue the workflow.