Ios7.1.2 email server authentication error

Question

We have a problem sending email using iMail client on a) iPad (ios7.1.2(11D257) and b) iMac (Auto updating Mavericks OS10). However, we can send email from iPad (ios7.1.1 (11D201). All three devices can receive email.
All machines use the same email account and servers. All are using the same email client. All have been working effectively for past 4 years - the problem started about 1 month ago.
Have spent "hours" with email service provider to troubleshoot the problem. Here is a list of the steps we have taken:
1) checked email servers, confirming that email accounts can both send and receive email. This included testing via a webmail client, and from a Microsoft Outlook client. In both cases the tests confirmed that email can be received AND sent via the email server.
2) setup alternate email servers, on different ports, on iPad - can always receive email but cannot send. The error message that is received is "username or password for 'mail.iinet.net.au' is incorrect"
3) deleted email accounts and rest device to wipe it clean, then started from scratch - can establish the email account, can receive email, but still get the same error message when trying to send email "username of password for 'mail.iinet.net.au' is incorrect"
4) tried alternative email client (CloudMagic, Evomail, Canonball) - not possible to connect to the email account, typical error is "unable to verify your account information"
5) tried to setup account on iPhone across mobile phone network to isolate whether problem was local WiFi - same result
The only thing that has shone any light on this was when we identified the outgoing mail server as "mailout.comhem,se" with no authentication. With this setting email would send. This could suggest a problem with the WiFi network, but it has been working perfectly well up till now, and on other WiFi networks. It also does not explain the problem with iMac from home which is directly connected to an ADSL service provided by our email service provider (no intermediary in play at all).  This also means that for every new WiFi network that I use (I travel a lot) I will need to find the details of an intermediate outgoing mail server for the specific WiFi provider. It is not clear why routing through an intermediary email server overcomes the authentication error at the destination email server, unless there is some more fundamental problem at play.
The authentication error has been isolated to somewhere between the device and the server - could there be some ios7.1.2 issue at play that is causing the authentication to fail, but not when directed through an intermediary mail server?
This problem is deeply frustrating, and any help would be greatly appreciated

Answer 1

I haven't ran across this, but I do see that there is no SQL Instance Name in your screenshot. Try putting SQLTMS in there and then click next and see what happens. Or if you know the name of your TMS database instance, put that in there.