Not having sent any message today 1 March on trying to send a message why do I get. Message from Mingle2 that says I have exceeded the daily quota? This does not make any sense.

Why did I encounter an email limit?

We had to place a limit on first-contact emails because of spammers. Basically, this cuts down the number of first-contact emails that one can send within a two-to-three-day period (we can't divulge anymore information about this limit). However, a member affected by this limit will still be able to send an unlimited number of emails to those with whom he or she has already had some back-and-forth. It should be noted that MinglePlus members are exempt.

http://mingle2.com/welcome/faq_message#email_limit