Problems sending Emails

[Jim]

Giuseppe Fuggiano wrote:
> 2009/4/29 Jim <mickeyboa at sbcglobal.net>:
>   
>> FC10/KDE4.2/ Thunderbird
>>
>> Sending Email Out to AOL.com.
>> When I send a Email to a person at AOL.com I get a email , Failure to Send ,
>> Has anyone had problems like this ?
>> They say the reason they can't send is because of a  "421 Error"
>>
>> My ISP ATT says it's because of Thunderbird, So I just hung up on them.
>>     
>
> Hi Jim,
> Your question is not very complete. It would be better to know _who_
> emits that error and the complete string.  What your ISP ATT is saying
> exactly about Thunderbird?  The 421 error could refer to many
> protocols...
>
> Check these parameters:
>  * The SMTP server should be a valid.
>  * Also the recipient.
>
> Bye
>   
I did verify the smtp settings with my ISP and they they are correct.
By reading the "Failure" email I'm getting back, below is the part of 
the email.




Hi. This is the qmail-send program at yahoo.com.
I'm afraid I wasn't able to deliver your message to the following addresses.
This is a permanent error; I've given up. Sorry it didn't work out.

<xxxxxxxx at aol.com>:
64.12.222.197 does not like recipient.
Remote host said: 550 MAILBOX NOT FOUND
Giving up on 64.12.222.197.