Email account got Sending Outgoing Email suspended automatically

[manoaratefy]

Good morning,

I have issue with one email account in my server. The radio button "Sending Outgoing Email" is constantly moving automatically into "Suspend" under cPanel > Email accounts.
I don't see any API request made in logs which can cause this. Is there any automated process inside cPanel changing this value? Is there any relevant log I should check? I tried almost all logs here but no luck.
Thanks in advance.

 

[cPRex]

Hey there! In WHM >> Tweak Settings do you have either "Maximum percentage of failed or deferred messages a domain may send per hour" or "Number of failed or deferred messages a domain may send before protections can be triggered" enabled? That would cause an account to get temporarily suspended from sending messages.