Re: [Exim] Yahoo and sender verification callout

> when I try to send a bounce to a non-existent yahoo address, the yahoo
> mailservers say "250" to my RCPT command to say "554" after I have
> transmitted the message.
>
> This - of couse - makes sender verification callout for yahoo e-mail
> impossible since I actually need to send a message to know if an
> account is valid.
>
> Any ideas why Yahoo is doing this? I doubt that they actually want to
> make sender verification impossible.

callout sometimes will work for yahoo.com

2003-05-20 07:37:08 H=sid2.catt.com [64.18.100.12] sender verify fail for
<friendhowdy2u@???>: response to "RCPT TO:<friendhowdy2u@???>"
from mx1.mail.yahoo.com [64.157.4.78] was: 553 VS10-RT Possible forgery or
deactivated due to abuse (#5.1.1)