Re: [exim] 451 Could not complete sender verify callout

jduncan wrote:
> Hi, I have someone who keeps getting this error message when emailing me. I
> am hosted with a company using exim who say it the other persons fault that
> the email is not being sent. However when searching the internet it seems to
> be my hosts fault as the error seems to occur when the mail server the email
> is being set to tries to verify the email and fails so it blocks the email.
> Could this be because of the way the other persons mail server is set up?
> They don't seem to have their own mail server is all, they are going through
> their hosts mail server I think.
>

Hi,

Could you post some logs of the transaction?
Actually, when the sender does not verify with a 451 error, it is
generally a DNS error or a timeout issue. A loh would be much
appreciated so that we can check your issue.