I have a client whom needs to verify a third party email address so they can send emails from their xtra account. When trying to verify they receive the following message from Yahoo:

'The system is experiencing some problems, please try again in a few minutes. (Error: #77231)'

Settings:

Incoming Server: pop3.farmside.co.nz 

Outgoing Server: send.xtra.co.nz :port 465

Any suggestions?