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Emails in approval box when approved throws an error "email address is invalid"
12/15/2021 
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Description
Some emails in approval box fail to get delivered with an error message "Total 1 message(s) selected.Failed to deliver 1 message(s).
Failed to deliver below recipients. Recipients might be invalid, consider deleting the message".
This article describes some of the checks and troubleshooting steps to help in addressing the issue.
Resolution
- Ensure that the recipient to whom the email is approved is a legitimate user
- Check if Email security lists that user under Manage | users , group and organization
- If the user is valid and still the email is getting rejected, check on the firewall that's sitting infront of the mail server if any security services are preventing the attachments(if any) that are present in the email
- Doing packet capture on the firewall with destination tcp port 25 and approving the email will help to analyze the complete session and check which server is rejecting the connection.
- Common reason would be Insufficient system resources on the mail server which will be resolved by increasing the diskspace on the mail server and security services like GAV enabled for SMTP scanning might be blocking attachments.
List of IPs email will be delivered by HES are:
For NOAM Customers: 173.240.210.0/24, 173.240.213.0/24 and 204.212.170.10
For EU Customers: 173.240.221.0/24
If the problem still persists, please contact our technical support team.
There are two ways to contact technical support:
1. Online: Visit mysonicwall.com. Once logged in select Resources & Support | Support | Create Case.
2. By phone: please use our toll-free number at 1-888-793-2830. Please have your SonicWall serial number available to create a new support case.
If you do not have a mysonicwall.com account create one for free!
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