I get this error “Send Outlook Main Message: One or more names is not recognized” around 50% of the times when I run my process. My process need to send out 100 emails, they all have the same format which is “bxxxxxx” where “x” is any digit ranging from 0 to 9.

Sometimes thr process correctly sends mails, for example for “b309912” and sometimes it does not, for example for “b222712”. What might the issue be here?