Mail sends from webmail but not outlook

I have a reseller with her own nameservers who was having no problems until a couple days ago.

She can send outgoing mail from webmail, but when she tries to send from outlook express she gets errors and the mail won't send.

Here is the error she is getting:
Subject 'Re: .', Account:
'gap@EDITED.com', Server: 'mail.EDITED.com', Protocol: SMTP,
Server Response: '421 server5.affiliate-sites.net Service not available -
SIGTERM or SIGINT received - closing connection.', Port: 25, Secure(SSL):
No, Server Error: 421, Error Number: 0x800CCC67
I googled the error code 0x800CCC67 and it is supposedly a problem with outlook express, however, the mail stopped sending from outlook express on a second computer simultaneously.

I enabled port 26, that didn't work. The user has deleted her accounts in outlook and recreated- no change.

I updated cpanel- no change.

I did notice in the error there is mention of Secure(SSL)
There is no SSL certificate on the server, is that significant? Or is it normal for an error like that?

Sorry if I'm not sounding real bright right now, I've had a very loooooooonnnnnnnggggggg day and falling asleep on my keyboard here, but I sure want to get this client's mail working.

TIA

 

 

 

 

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