script send email errors

RouterOS Scripting
1

Hay,
I face a new problem its not happend before its just since two weeks.
I have scripts to send emails (backup,Ip address)
but when i run any of these script its show errors but some times its work
i attach the email log show the error
Can any one advice me about these porblem and how i can solve

With regards
isk1.jpg

2

Just look at logs. Server responded that it reached its limits, what else do you need?

3

What that mean “Server has reached limit..”
and why i got these message?solution for thes?

4

solution is to setup the limits on your mail server correctly