Confluence5.6.6 version, mail cannot be received

problem description

added 163 mailboxes to the configuration. Click Test to receive the test email. However, after the modification / addition, the email corresponding to the modified content cannot be received, that is, none of the emails except the test message can be received

the platform version of the problem and what methods you have tried

confluence 5.6.6

is based on https://blog.csdn.net/u014307.

Jira atlassian confluence
Jul.23,2021

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MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1e55a2d-45345.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1e55a2d-45345.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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