A message that you sent contained one or more recipient addresses that were incorrectly constructed:
GOV@OptimistSC.org; GOVD@OptimistSC.org: malformed address: ; GOVD@OptimistSC.org may not follow GOV@OptimistSC.org
This address has been ignored. The other addresses in the message were syntactically valid and have been passed on for an attempt at delivery.
I know this is not a FB error message but, what design changes do I need to avoid the error?