Overview

Mailgun has thresholds in place that if exceeded will result in a domain being temporarily disabled. These limits are in place to protect your email reputation in case your system is compromised by a spammer or someone in your organization makes a large mistake.

If you do not have a good reputation tied to your domain and IP address, your email will not reach your recipients’ inboxes.

The number one reason we see people get blocked is that they have a bad mailing list. Most of these lists have bad email addresses and include spam traps. ESPs are good at recognizing bad mailing lists. Best practices for lowering bounce rates:

1. Clean your mailing list of invalid email addresses.
2. Only send emails to recipients that have signed up to receive them.
3. Verify the email address is correct with a confirmation email (aka, confirmed opt-in).
4. We recommend using our Mailgun Validate service at the point of signup to reduce invalid email addresses.
5. Don’t purchase your list or scrape websites for emails.

Need Support?

Our Support Team here at Sinch Mailgun is happy to help! Reach out to us in the Support page of your Mailgun Control Panel, and we'll be with you shortly!