Newly Created subscription for new report fails with error " Failure sending mail: The specified string is not in the form required for an e-mail address.Mail will not be resent."
It is defined in the same way the existing one, using same ReportServer with unchanged config since it started working. Using full email addresses ([email protected]), existing SMTP Server that is set up on Exchange Server (working, other services use it successfully) but queue does not pick up new subscription emails. Security is individually managed for this report (limited acces, users added using full DOMAIN\User Name notation).
There were changes in firewall/proxy settings, but SSRS is internal anyway so don't see the connection..
Where else can I look to see what's the problem?