Sending Limits per Plan

To maintain high deliverability for everyone, TrekMail enforces the following daily sending limits.

Limits by Plan

• Mailbox Limit: The max emails a single user (e.g., alice@domain.com) can send in 24 hours.
• Account Limit: The total emails all your users combined can send.
• Recipients: The number of people on the "To" + "Cc" + "Bcc" line of a single email.

Safety Limits for New Accounts

To maintain deliverability for all users, new accounts that have not yet made a payment operate under reduced sending limits called Safety Limits. These apply to TrekMail Platform SMTP only and are removed automatically once your first payment is processed.

Safety Limits During Trial

If you're on a paid plan trial and haven't completed a payment yet, these limits apply:

Safety Limits After Trial (Pre-Payment)

If your trial has expired or your first payment failed, these reduced limits apply:

Domain Cap for New Accounts

New accounts that have not yet made a payment are also limited to a maximum of 5 domains, regardless of the plan limit. This cap is removed automatically once your first payment is processed.

How to remove Safety Limits: Complete your first payment. Limits are upgraded automatically and immediately upon successful payment processing.

Note: Safety Limits only apply when using TrekMail Platform SMTP. If you use Bring Your Own SMTP (BYO SMTP), the sending restrictions do not apply (the domain cap still applies).

SMTP Hourly Rate Limits

In addition to daily limits, TrekMail enforces per-account hourly caps on SMTP message submissions. This prevents any single account from overwhelming shared infrastructure.

• These limits apply to messages submitted via TrekMail Platform SMTP only.
• If you use Bring Your Own SMTP, hourly limits are governed by your external provider.
• You will receive a warning email when you reach 80% of your hourly limit.
• Counters reset at the top of each hour.

What happens if I hit the limit?

1. Daily Limit: You will receive a "Daily limit exceeded" error. You must wait for the 24-hour rolling window to reset.
2. Hourly SMTP Limit: Your mail client will receive a temporary deferral (4.7.1 Hourly sending limit reached). Messages are not rejected — simply retry after the hour resets.
3. Queueing: Webmail might try to queue the message, but desktop clients (Outlook) will simply fail to send.

Best practices

• Don't Spam: These limits are generous for business use. If you need to send 50,000 emails a day for marketing, use a dedicated marketing service (like Mailchimp or Brevo) instead of business email.
• Warm Up: Even if your plan allows 2,000 emails, don't send them all on Day 1. Start slow.

IMAP Connection Limits

In addition to sending limits, TrekMail enforces concurrent IMAP connection limits to maintain server performance.

• Per IP: Maximum simultaneous IMAP connections from a single IP address.
• Total: Maximum simultaneous IMAP connections across all your devices.

These limits apply to incoming mail connections (IMAP) and help ensure fair resource distribution. If you regularly exceed these limits, consider upgrading to a higher plan.

Custom SMTP Rules

If you use Bring Your Own SMTP, these limits do not apply. You are subject only to the limits of your external provider (Amazon SES, SendGrid, etc.).