SMTP & Sending

Master TrekMail SMTP services. Choose between our fully managed SMTP solution or bring your own provider for maximum control and flexibility.

What you'll learn

1 Zero-config sending on Starter and up — how the shared IP pool, DKIM/SPF alignment, and reputation management work, plus when to use BYO SMTP.
2 How to connect SES, SendGrid, Mailgun, or other SMTP providers.
3 Review the daily sending limits for each TrekMail plan. Understand per-mailbox and per-account caps to plan your email volume accordingly.

Your curated guide for this category.

Follow this recommended order to get the most out of this category.

5 articles

1

Managed TrekMail SMTP: How It Works
Zero-config sending on Starter and up — how the shared IP pool, DKIM/SPF alignment, and reputation management work, plus when to use BYO SMTP.
2

Bring Your Own SMTP (Custom SMTP)
How to connect SES, SendGrid, Mailgun, or other SMTP providers.
3

TrekMail Sending Limits by Plan
Review the daily sending limits for each TrekMail plan. Understand per-mailbox and per-account caps to plan your email volume accordingly.
4

Domain Warm-Up Rules
Warm-up percentages and examples for each plan.
5

Fixing Common Email Sending Errors
Decode SMTP error codes — 535 auth failed, 554 relay denied, 550 limit exceeded, port-25 timeouts, and SPF/DKIM bounces — with a fix for each.

Domain Warm-Up Rules

Warm-up percentages and examples for each plan.