On one of the sbs 2011 servers that we support, there seems to be an issue with outgoing emails. If i look in the exchange 2010 que viewer, there is loads of messages that are getting held up. i have noticed that if i restart the microsoft exchange "transport" service, all emails in the que go through and any mail after that goes through instantly. Then about ten minutes later, the same issue occurs. Sometimes it can take upto 40mins to send a 40kb message.
Thanks in advance.