==== Required information ====
- iRedMail version: 2.1.1
- Store mail accounts in which backend (LDAP/MySQL/PGSQL): LDAP
- Linux/BSD distribution name and version: Ubuntu
- Related log if you're reporting an issue:
====

Greetings Zhang,
Sometimes users facing problem in sending emails to some domains as Your message did not reach some or all of the intended recipients.

The following recipient(s) could not be reached:

                450 4.1.2 <mail@example.com>: Recipient address rejected: Domain not found

NOTE : This type of problem only occurs for certain time of period after that emails will flow easily. This problem keeps on repeating.

Please help us to fix this issue.

regards,
Shaik