Per-Domain SMTP & the Account Default
Every domain decides for itself how its outbound email is sent. You can point each domain at our managed SMTP or at your own provider — and a single account-wide default decides what new domains start on, so you set things up once and they're ready to go.
The three routes on a domain
On a domain's SMTP tab you pick one of three routes for how that one domain sends:
- TrekMail SMTP — our managed sending. Nothing to configure; we handle the IPs, DKIM/SPF alignment and reputation, and the tab shows the host, ports and encryption. Available on paid plans.
- Saved SMTP profile — send through one of your own providers (Amazon SES, SendGrid, Mailgun, Postmark, and so on) that you've already saved to the account. Pick it from the dropdown. Profiles are account-wide and reusable across domains.
- New custom SMTP profile — add a new provider (host, port, encryption, username, password) and use it for this domain in one step. Test the connection, then save and use it.
The account-wide default
The default isn't a fourth route — it's a pair of controls shown under the route you've chosen on the SMTP tab:
- Make this the account default (toggle) — turn it on and new domains you add start on this exact route. Set a saved profile as the default and every new domain comes up pre-pointed at it; choose managed TrekMail SMTP and they start there instead.
- Apply to all domains (button) — a one-time switch of every domain in the account to this route, after a confirmation. Use it to move your whole account onto one provider, or back onto managed SMTP, in a single step.
If you've never set a default, it falls back sensibly on its own: paid plans default to managed TrekMail SMTP, free plans start unconfigured until you choose a route.
Each domain keeps its own route
Setting the default only changes what new domains start on — it doesn't quietly re-route the domains you've already configured. When you want everything on the same route right now, that's exactly what the Apply to all domains button is for. One default for the common case, full control on the exceptions.
Good to know
- If a profile is being used as the account default and you delete it, the default falls back to your plan baseline and the domains that were on that profile are reassigned — sending is never left pointing at a missing profile.
- A custom profile is usually tied to a specific provider and sending domain (SPF/DKIM, return-path). If you point unrelated domains at it, make sure that provider is authorized to send for them.
- Sending limits depend on the route: managed SMTP follows your TrekMail plan limits, while a custom profile follows whatever limits your provider sets.