Smtp up and down every 10 minute

after transferring my domain gilezi.com i frequently (20times in 24 hour) face smtp error in mxtoolbox.com
smtp up and down every 10 minute. why??

Mail is not handled by Cloudflare, so you will have to contact your host about this issue.

i am admin, what should i do? please tell me

Classic system debugging. Unfortunately that topic is beyond the scope of this forum.

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