Hello All, Either Cox fixed the problem or I just did. If you are still not able to send emails then I corrected my issue with sending cox emails using outlook 2013 (win7 64bit) and I can send from my iphone now. I will try to explain as best as possible what I did and include links to the 2 webpages that helped me, links at bottom. You should have some experience editing the registry before doing all this!! I did some of the items the Microsoft website showed doing first.
I checked my installed updates in windows update and my computer already had the KB3140245. I then used regedit.exe to create the below. I created QWORD instead of DWORD because I have a 64bit system. you have to create the TLS 1.1 key and then highlight that and create the key named client under that, do the same for TLS 1.2, inside client is where you create the QWORD or DWORD
Then I clicked the download button for Easy Fix and ran the Easy Fix (not sure if this was needed but I did it)
Then I stopped with the Microsoft webpage and used the 2nd webpage (link below) preformed step 2, I skipped step 3 because I already did that. Then did step 4 Except after restarting I went into my cox email settings in outlook and set my outgoing server to 587 and encryption to TLS (like Cox says to now use.)
Create the necessary subkeys for TLS 1.1 and 1.2; create the DisabledByDefault DWORD values and set it to 0 in the following locations:
Registry location: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\TLS 1.1\Client
DWORD name: DisabledByDefault
DWORD value: 0
Registry location: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\TLS 1.2\Client
DWORD name: DisabledByDefault
DWORD value: 0
https://support.microsoft.com/en-us/help/3140245/update-to-enable-tls-1-1-and-tls-1-2-as-default-secure-protocols-in-wi
https://documentation.cpanel.net/display/CKB/How+to+Configure+Microsoft+Windows+7+to+use+TLS+Version+1.2