This article provides step-by-step instructions on how to troubleshoot email failures occurring with the error all hosts for 'domain.com' have been failing for a long time (and retry time not reached)
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We explain the process of checking MX records and demonstrate how to perform a telnet connection to determine if the recipient server is experiencing downtime. Additionally, we offer insights and recommendations to mitigate such errors.
Troubleshoot Bounceback
- Find the recipient domain's MX records using an online DNS lookup tool, such as dnschecker.org
- Type the domain in the search text box
- Switch the A dropdown box to MX
- Click Search
- Access the terminal of the sending server
- From cPanel, find the Terminal tool
- Alternatively, SSH into the server
- Attempt a telnet connection to the recipient server by running the following
telnet mail.domain.com 25
REPLACE: mail.domain.com with the recipient's MX record.
NOTE: This manually attempts a connection over the email port, allowing you to test if this server is accepting email connections at all. - If the connection is unsuccessful, attempt step 3 from another server, or from your personal computer
- On Windows machines, the terminal can be accessed by searching cmd using the search feature in the start bar
- On Mac, the terminal can be accessed by clicking the launchpad icon in the dock and typing terminal in the search field
- If the connection is still unsuccessful, the issue lies with the recipient server
- If the connection is successful, the recipient server is accepting email connections but NOT accepting them from this specific server
- The recipient should be contacted to see why this server is blocked
Additional Troubleshooting on VPS and Dedicated
TIP: Additional information on this specific error can be found on the cPanel Support website.
- SSH into the server as root
- Run
exinext domain.com
REPLACE: domain.com with the recipient domain. - If any emails are queued for retry, the command will output additional information
EXAMPLE:
tier1adv@vps1234 [~]$ exinext domain.com. Transport: mail.domain.com [12.34.56.78/NULL] error 111: Connection refused first failed: 29-Dec-2022 00:46:32 last tried: 24-Jan-2023 10:55:33 next try at: 24-Jan-2023 18:55:33 past final cutoff time
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