This is using MS SBS 2011 server. Exchange 2010 also running on this server. However, few users told me that they seem to have not receiving some expected mails, and they request me to check through the exchange. I did a thorough check, look like everything is working fine except for the smtp test from MXToolbox with the 2 warnings as attached.
Does the not supporting TLS matter? Shall I change so as it support TLS and so how?