Message limit

I see some people have their "message limit reached". How does this happen and how can I prevented?

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It means that they have sent as many messages with the mail system as they can. It's most likely to avoid spamming and mass mails. I think it resets after awhile though.

What about deleting? Does that help?

Deleting the mail won't help, no. You will have to wait until the communication limit is reset. Which may take up to an hour or a few hours.