Mail will send sometimes and won't send other times

Hello,
Our mail in our whole office with sometimes send out using our pop account, and then other times the recipient will just never receive it. We get no warning if the mail was never delivered we just find out a week later that so and so never got our email. It has worked fine for years, now all of a sudden it variates.
Getting mail has never been an issue, only send (sometimes)

Need more information - way more.
For example, does the problem affect ALL mail at a certain time (e.g. all messages sent to any user fail) or does it only fail for some messages?
Does the problem affect particular recipient addresses or domains? or does it affect everyone regardless of email address.
What do the mail logs have to say about it? Do the logs indicate that the message was sent? or that there was some error?

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Mail will send sometimes and won't send other times

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