GoDaddy Email Playing Up

I'm using GoDaddy as per usual as a low-cost emailer for a few marketing emails, which has been working fine for a coupl'a months or so.
I've been using, port 25, no SSL,( i couldn't get any of the other ports to work, 80, 465(SSL=true), 3535.)
Then all of a sudden I get:
"Sorry, that domain isn't in my list of allowed rcpthosts."
out of the blue without any changes from my end. The GoDaddy helpline say there's no problem with my account, must be my app, blah blah.
When I look on line, it seems this is quite a common problem that seems to appear for no reason.
Does anyone else experience this?
Does it just free up again?
Is there anything I can do?
As I said, none of the other ports worked for me before. I am definitely doing the authentication thing .
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amitnepalConnect With a Mentor Commented:
Have you tried sending email to different email addresses ? with different domains ?
This error generally indicates authentication failure. Did you change the password for the email account ? Try to re configure the smtp details on your application, re-enter your email and password, also do not forget to click on my smtp requires authentication.  Also just to test , you can configure that account in your outlook or thunderbird and see if it works there.

If you have SSL options try using port 567 with TLS .
Silas2Author Commented:
Thanks for having a look for me.
The app (mail client) is in Microsoft .Net, it basically goes to sleep all night, then wakes up in the morning and fires 100 emails using GoDaddy, it's been working fine and suddenly stopped working with the same settings, that's what i don't understand, port 25, no SSL.

With regards the authentication, i dont know if you familiar with the .Net Mail library, but I guess it's just a wrapper round the low-level network commands, here's a snippet of the send code:
 SmtpServer.Port = System.Convert.ToInt32(emailJob.SMTPPort);
                    SmtpServer.UseDefaultCredentials = false;
                    SmtpServer.Credentials = new System.Net.NetworkCredential(emailJob.EmailFrom, emailJob.EmailPassword);
                    SmtpServer.EnableSsl = emailJob.EmailReqSSL == 1;

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Which i guess is the same as 'Requires authentication in Outlook'?
I did try 567 and SSL ==true (which i guess is .Net's take on TLS).
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Silas2Author Commented:
Actually, just looking at this:, I realise that the error is saying that it doesn't recognize the domain I'm relaying thru, which are being hosted at GoDaddy for me.
I wonder if somehow GoDaddy has lost my list of domains?
Do you think maybe there could be someway to refresh the list or something?
Silas2Author Commented:
when you say "... to different email addresses ....", yes it is a list of different recipients.
In terms of domains hosted at GoDaddy, yes i'm relaying thru several using a few mailboxes. About 3 domains + 10 mailboxes.
Silas2Author Commented:
Thanks for having a look at this for me. I never really got to the reason for it, but deleting and remaking the accounts made accounts which were OK, no idea why. Some corruption in the account info GoDaddy's end maybe(?)
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