Deliverability
Overview
Understanding mailbox sending limits and volume control settings is crucial for maintaining good email deliverability and ensuring your campaigns run smoothly. These settings help you manage how many emails you send, how quickly they go out, and how your mailbox warms up over time to avoid spam filters and maintain a positive sender reputation.
By configuring these controls properly, you can simulate natural sending patterns, protect your domain reputation, and optimize the performance of your outbound campaigns.
Daily Sending Limit and Sending Delay Minimum
The Daily Sending Limit sets the maximum number of sending operations your mailbox can perform each day. This limit applies collectively to all campaigns using that mailbox, ensuring you don’t exceed safe sending volumes. When the limit is reached, sending pauses and automatically resumes on the next valid day according to your campaign rules.
The Sending Delay Minimum controls the minimum time interval between individual sending operations, measured in minutes. This delay helps space out your emails to mimic natural sending behavior. A lower delay combined with a high daily limit results in a denser sending pattern, which may look unnatural to spam filters. Conversely, a higher delay slows down sending and appears more organic.
How These Settings Affect Deliverability
- A low daily limit keeps your sending volume conservative, reducing the risk of being flagged as spam.
- A higher sending delay spaces out emails, helping avoid bulk sending patterns that trigger spam filters.
- Balancing these two settings is key: too many emails too fast can hurt your sender reputation.
Step-by-Step: Setting Daily Limit and Sending Delay
- Navigate to the sidebar and click on “Mailboxes”.
- Select the mailbox you want to configure.
- Go to the “Deliverability” tab.
- Enter your desired value for Daily Sending Limit.
- Set the Sending Delay Minimum in minutes, ensuring it fits within the allowable range based on your daily limit.
- Save your changes.
Remember, these limits apply across all campaigns using the mailbox, so plan accordingly.
Sending Volume Ramp-Up and Ramp-Up Interval
The Sending Volume Ramp-Up feature is designed to gradually increase your mailbox’s daily sending capacity over time. This simulates a natural warm-up process, which is essential for new mailboxes or domains to build trust with email providers.
The Ramp-Up Interval defines a numeric range from which a random daily increment is selected. Each sending day, your mailbox’s capacity increases by this randomly chosen amount until it reaches the maximum daily sending limit.
How Ramp-Up Works
- When enabled, the ramp-up resets for each new campaign, allowing you to warm-up each campaign separately.
- The increase happens daily, helping avoid sudden spikes in sending volume.
- The random interval prevents predictable sending patterns, further improving deliverability.
Step-by-Step: Configuring Ramp-Up
- Go to “Mailboxes” in the sidebar and select your mailbox.
- Open the “Deliverability” tab.
- Enable Sending Volume Ramp-Up.
- Define the Ramp-Up Interval by entering a minimum and maximum daily increment (e.g., 10-20).
- Save your settings.
Use ramp-up especially for newly connected domains to build a healthy sending reputation.
Sending Logic and Best Practices
The sending process respects your campaign rules such as weekdays and time windows, ensuring emails only go out during allowed periods. If your mailbox hits the daily sending limit, the system automatically selects the next valid sending slot based on these rules.
To maintain optimal deliverability, follow these best practices:
- Start Conservatively: Set low daily limits for new mailboxes to avoid overwhelming email providers.
- Use Ramp-Up: Gradually increase sending volume to warm up your mailbox and domain.
- Avoid High Volume + Low Delay: Combining a high daily limit with a very low sending delay can look unnatural and harm your reputation.
- Increase Gradually: Scale sending volume step-by-step while monitoring bounce and reply rates.
- Monitor Metrics: Watch for changes in bounce rates or replies, adjusting limits if needed.
Sub-Section: Why Gradual Volume Increase Matters
Gradually increasing your sending volume helps build trust with mailbox providers by avoiding sudden spikes that trigger spam filters. This steady approach improves your chances of landing in the inbox rather than the spam folder.
Troubleshooting Common Issues
If you encounter issues with sending, understanding how your limits and delays affect behavior can help you quickly identify and resolve problems.
Common Problems and Solutions
- Emails stop sending: This usually means your daily sending limit has been reached. Wait until the next valid sending day for sending to resume.
- Sending too fast: If emails are going out too quickly, increase the sending delay minimum to space them out more naturally.
- Ramp-Up not increasing: Check that your ramp-up interval range is properly set and that the campaign has reset to start ramping up again.
Daily Limit Reached
When the daily limit is reached, no more emails will be sent until the next valid day. Verify your limit and adjust if necessary.