email & reliability

I have some concerns with email.

How reliable is email?
If i have email such as myname@mydomain.com, this is email going to my own mail server and not something like Gmail.com.

I trust hotmail and gmail a whole lot more than the one tied to my own domain name.
If it fails how ill i know?

If I put a customer on their own domain on a shared server and their email suddenly stops sending them messages, how will we know it has failed. Perhaps after a week of no emails?

Thanks.

 

 

 

 

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