Managed TrekMail SMTP: How It Works

Managed TrekMail SMTP is the built-in sending route for a domain on Starter, Pro, or Agency. You choose it in the domain's SMTP settings; TrekMail then delivers mail sent from that domain through the TrekMail sending service. It is a good default when you do not need to maintain a separate sending provider.

When to use it

Choose Managed SMTP when you want TrekMail to handle the sending route for normal business mail, replies, account messages, and other expected correspondence.

Choose a custom SMTP profile when a domain must use a provider you already manage. That can make sense when the provider owns the sender identity, analytics, or compliance setup you need. A custom profile does not turn off TrekMail's account safety controls, so confirm both TrekMail's limits and the provider's limits before planning a high-volume send.

Choose the sending route for a domain

1. Open Domains in the dashboard and select the domain.
2. Open SMTP.
3. Choose TrekMail SMTP for the managed route, or select a saved profile to use your own provider.
4. Save the route.
5. Send a real test message to an address you control and check both delivery and the visible From address.

The route is set per domain. If most new domains should use the same route, use Make this the account default. If you intentionally want to replace routes on existing domains, use Apply to all domains only after checking each domain that will be affected. See Per-Domain SMTP & the Account Default.

Set up a mail app correctly

For Outlook, Apple Mail, a mobile app, or another mail client, use the IMAP and SMTP host, port, encryption, and mailbox credentials shown in that mailbox's Apps & devices setup screen. The public submission endpoint remains the TrekMail endpoint even if the domain uses a custom SMTP profile; TrekMail applies the domain's selected route behind that sign-in.

Do not substitute a hostname copied from another account. A White Label domain can show branded client hostnames, and the setup screen gives the exact values for the mailbox you are configuring. Use the mailbox password, not your TrekMail dashboard password.

Authentication and deliverability

Before depending on any sending route, make sure the domain is active and its DNS records are healthy. The domain's DNS page is the authority for the MX, SPF, DKIM, and DMARC records required for that particular domain.

With Managed SMTP, TrekMail handles the delivery route after the domain passes its DNS setup. This does not make every message land in the inbox: recipient providers also assess list quality, sending patterns, message content, and complaints. Keep sends expected, use confirmed recipients, and investigate bounces instead of repeatedly retrying them.

If you choose a custom profile, the external provider must be authorized to send for the domain and should sign mail with its own DKIM setup. Add only the SPF and DKIM records supplied by that provider. Do not publish a second SPF record; merge authorised services into the one SPF record for the domain. See Required DNS Records.

Limits, safety limits, and warm-up

Managed sending follows the plan's per-mailbox, per-account, recipient, and hourly limits. Accounts that have not yet completed a paid mail-plan charge can have lower safety limits. A new domain also starts with a seven-day warm-up: 40% of the rate-based limit on days 1 to 3, 70% on days 4 to 7, then 100% from day 8.

Payment removes the never-paid safety limit when the subscription becomes active, but it does not skip the new-domain warm-up. The current limits displayed in the SMTP tab and dashboard are the values to use when preparing a send. For the full table and what counts toward it, read TrekMail Sending Limits by Plan and Domain Warm-Up Rules.

If sending does not work

Check these in order:

1. Confirm the domain is Active in Domains and has a sending route selected.
2. Confirm the mailbox can send and use its mailbox password in the mail app.
3. Check the dashboard for a verification, billing, safety-limit, or sending-suspension notice.
4. Compare the app's server and security settings with Apps & devices.
5. Send a small test to an address you control. If it fails, keep the error text and time for support, but do not include a password or access token.

Use Fixing Common Email Sending Errors for a plain-language error guide. For sustained volume or delivery problems, also review I Can't Send Emails and Emails Go to Spam.

Switching from a custom profile

To move a domain back to Managed SMTP, open its SMTP tab, select TrekMail SMTP, save, and test a new message. This changes future outbound mail for that domain. It does not remove existing messages or change the domain's incoming mail routing.