Group Invitations Does Not Notify

Upgraded to 7.1b and it went without problems. However when I invite current members to join a group there is no invitation send.  I tried inviting another account that I have and received no notification.

Does anyone else have this problem - and how do I fix it?

Try to use SMTP Mailer module to send mails, also check if SMTP Mailer module settings are correct.

Thank you. I changed my SMTP server credentials and the invitations emails are sent now.  Best regards.