Got this on outlook now!

An unknown error has occurred. Subject 'Your Gumtree Dublin ad: Girls
and Guys wanted for discreet no strings attached fun and good times',
Account: 'Kastle Karaoke', Server: 'smtp.mysmart.ie', Protocol: SMTP,
Port: 25, Secure(SSL): No, Error Number: 0x800CCC0B

only happens when sending more than one email, it send the first one
and htne does this, any ideas?