Is there a way to get a better explaination of SMTP error?

[chipsafts]

We are getting the following warning errors for email sent to a customer:

Final-Recipient: RFC822; egalde@ci.wa.us
Action: delayed
Status: 4.4.2
Diagnostic-Code: SMTP; 451 4.4.1 reply: read error from
ci.wa.us.



I am trying to figure out what this actually means, and who exactly is having the problem.
I tried testing the targeted email using network-tools.com and it worked fine. So, I am somwhat stumped on how to proceed from here.

[falko]

Any errors in your mail log?

[chipsafts]

Jan 3 11:03:35 net sendmail[21954]: m03J31ep021951: to=<egalde@ci.wa.us>, delay=00:00:34, xdelay=00:00:31, mailer=esmtp, pri=211171, relay=mail.ci.wa.us. [1.1.1.1], dsn=4.4.2, stat=Deferred: Connection timed out with mail.ci.wa.us.


[1.1.1.1] was actually the real ip address.

[falko]

Please check if your server got blacklisted: http://www.mxtoolbox.com/blacklists.aspx

[chipsafts]

nope, not BlackListed

[falko]

Then you should ask the admin of mail.ci.wa.us why your server is blocked.

[chipsafts]

I am very confused by what the email server a.com is complaining about or what the actual error was.

> ----- The following addresses had permanent fatal errors -----
><maureen@a.com>
>
> ----- Transcript of session follows -----
>451 4.4.1 reply: read error from a.com.
><maureen@a.com>... Deferred: Connection timed out with a.com.
>Message could not be delivered for 3 hours
>Message will be deleted from queue
>
>Reporting-MTA: dns; net.s.com
>Arrival-Date: Tue, 22 Jan 2008 15:58:12 -0800
>
>Final-Recipient: RFC822; maureen@a.com
>Action: failed
>Status: 4.4.7

what actually is the error that happened -
4.4.7, 4.4.1 or 4.5.1 ? and why just this receipient?