Mails enter and then they don't

Hi, I have this problem. I regulary receive mails from a friend from the US. I live in Spain. We always use the same mail, mine is a mac.com - his a proper domain.name. But sometimes days goes past and I wonder if he had received mine... so we call each other. Then he says that he has answered each one of my mails... but they didn't end op in my mailbox.
My spam does not catch his mails. They just don't exist. We tried with my hotmail and there they all arrive. So this must be a mac-problem?

Found one mail my friend has forwarded me telling me this:
This message was created automatically by mail delivery software.
A message that you sent has not yet been delivered to one or more of its
recipients after more than 72 hours on the queue on
murcielago.cwihosting.com.
The message identifier is: 1HJGDj-0003EC-A9
The subject of the message is: RE: Els Frares
The date of the message is: Mon, 19 Feb 2007 13:38:29 -0800
The address to which the message has not yet been delivered is:
[email protected]
Delay reason: SMTP error from remote mail server after initial
connection:
host smtp-mx5.mac.com [17.250.244.61]: 452 try later
No action is required on your part. Delivery attempts will continue for
some time, and this warning may be repeated at intervals if the message
remains undelivered. Eventually the mail delivery software will give up,
and when that happens, the message will be returned to you.
anybody understands this?

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