MD 11:58 Leigh, this CC issue seems to be happening on this list only. # RFC 2822 specifies zero or one CC header del msg['cc'] msg['Cc'] = COMMASPACE.join([formataddr(i) for i in ccaddrs.values()]) to # RFC 2822 specifies zero or one CC header del msg['cc'] if ccaddrs: msg['Cc'] = COMMASPACE.join([formataddr(i) for i in ccaddrs.values()])