Problem delivering mail to mac.com

That's odd…if the mac.com smtp server is returning accurate error codes, and I assume it is, it looks like a server issue on their side. The 452 return code indicates:

Requested action not taken: insufficient system storage

How long has this been happening?

It's been happening for a couple of weeks. I only got around to investigating properly. One of my users would like his email forwarded to his mac.com address and hasn't been receiving any recently. It was forwarding correctly before that.

Everything looks okay at my end, but mac.com seems to be refusing SMTP connections from my Linode.

As I say, when I telnet to it from my local PC I have no problem.

Are you getting the 452 response immediately when you connect to port 25? Does it take 5 to 10 seconds? I assume you're not typing any commands first.

Where is your linode? (HE or Planet?)

From my HE linode:

% telnet smtp-mx1.mac.com 25
Trying 17.148.20.64...
Connected to smtp-mx1.mac.com.
Escape character is '^]'.
220 smtp-mx.mac.com ESMTP Service
quit
221 2.0.0 mac.com closing connection
Connection closed by foreign host.

[root@li7-51 ~]# telnet smtp-mx1.mac.com 25

Trying 17.148.20.64…

Connected to smtp-mx1.mac.com (17.148.20.64).

Escape character is '^]'.

220 smtp-mx.mac.com ESMTP Service

This is what I get from my linode.

Thanks for the info, and sorry for taking a while to get back. It seems to only be me that's affected.

I found mention of the 452 error here:

http://www.apple.com/support/dotmac/mail/

Though I wouldn't say the messages are "bouncing back" as such…

I have sent them a support request, so we'll see if that fixes it.