ECS主机使用hmailserver发送邮件失败，我已经设置了安全组规则，在其他主机测试没有问题。
Test: Collect server details
hMailServer version: hMailServer 5.6.4-B2283
Database type: MySQL
Test: Test IPv6
IPv6 support is available in operating system.
Test: Test outbound port
SMTP relayer not in use. Attempting mail.hmailserver.com:25...
Trying to connect to host mail.hmailserver.com...
Trying to connect to TCP/IP address 5.189.183.138 on port 25.
ERROR: It was not possible to connect.
Test: Test backup directory
ERROR: Backup directory has not been specified.
Test: Test MX records
Trying to resolve MX records for bosscome.com...
Host name found: mail.bosscome.com
Test: Test local connect
Connecting to TCP/IP address in MX records for local domain domain bosscome.com...
Trying to connect to host mail.bosscome.com...
Trying to connect to TCP/IP address 39.98.182.126 on port 25.
ERROR: It was not possible to connect.
ERROR: Was not able to open connection.
Test: Test message file locations
Relative message paths are stored in the database for all messages.
Test: Test IP range configuration
There is a total of 1 auto-ban IP ranges.
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