Another email problem "callout reused"

[w1z4rd]

Seriously.. this is my day for strange email error messages. What do you think of this one?

Your message did not reach some or all of the intended recipients.



Subject:

Sent: 2008/09/16 02:53 PM



The following recipient(s) could not be reached:



'[email protected]' on 2008/09/16 02:54 PM

550 (result of an earlier callout reused).

Now from what I understand.. a callout is when you email someone, their server then checks my email address`s mx records. Say I have the email address [email protected].

It will then do an MX lookup on emaildomain.co.za

Then it sill issue SMTP commands to make sure that the mx server accepts messages for [email protected]

If it does not then the domain is considered invalid... and you cant send to me and I cant to you.

Like.. wtf.. seriously... who puts that on their mail servers? I imagine that would effect your performance dramatically.