Hello mail-ext support team

email-ext (version 2.93) works most of the time,while at a sudden time, no email can be sent out. then sometime late it will recover

==>no email sent out

(job_a)***
16:39:11 Email was triggered for: Always*16:39:11* Sending email for trigger: Always*16:39:11* Sending email to: comatc@163.com16:39:13 Not sent to the following valid addresses: comatc@163.com16:39:13 Finished: SUCCESS
 ***
 

job_b***
16:59:11 Email was triggered for: Always*16:59:11* Email was triggered for: Unstable (Test Failures)16:59:11 Sending email for trigger: Always*16:59:11* Sending email to: comatc@163.com*16:59:12* Not sent to the following valid addresses: comatc@163.com*16:59:12* Sending email for trigger: Unstable (Test Failures)16:59:12 Sending email to: haijun.lin@nokia-sbell.com manli.1.zhong.ext@nokia-sbell.com jing.u.xu@nokia-sbell.com lihua.jiang@nokia-sbell.com rongpeng.a.mei@nokia-sbell.com*16:59:13* Not sent to the following valid addresses: haijun.lin@nokia-sbell.com manli.1.zhong.ext@nokia-sbell.com jing.u.xu@nokia-sbell.com lihua.jiang@nokia-sbell.com rongpeng.a.mei@nokia-sbell.com*16:59:13* Finished: UNSTABLE
***

==>email partly sent out

job_c***
16:49:10 Email was triggered for: Always 16:49:10 Email was triggered for: Unstable (Test Failures) 16:49:10 Sending email for trigger: Always 16:49:10 Sending email to: comatc@163.com
 
16:49:12 Sending email for trigger: Unstable (Test Failures) 16:49:12 Sending email to: xxx@aaaa.com yyy@aaaa.com zzzz@aaaa.com dddd@aaaa.com rfffff@aaaa.com
 
16:49:14 Not sent to the following valid addresses: xxx@aaaa.com yyy@aaaa.com zzzz@aaaa.com dddd@aaaa.com rfffff@aaaa.com 16:49:14 Finished: UNSTABLE
 ***

==>email sent out
**

job_d***

05:03:02 Email was triggered for: Always*05:03:02* Sending email for trigger: Always*05:03:02* Sending email to: comatc@163.com*05:03:04* Finished: SUCCESS
 ***

setting should be correct, since most of time can send out, email box has sufficient space too

pls help to find out the possible reasons, thanks