Unable to invite any member

I am getting this error message whenever I invite someone through email. The following is the error:

ERROR com.mycollab.spring.AppEventBus:35 - Error in event bus execution
com.mycollab.core.MyCollabException: org.apache.commons.mail.EmailException: javax.mail.internet.AddressException: Local address ends with dot in string

there isn't any dot before @, still it's showing that.