Mail cannot access the mail server, but other email clients do.

My web host recently had extended problems with the mail server my sites are on. Now, Mail on my iMac Intel 27 Duo says it cannot access the server. However, Thunderbird and Entourage Mac have no problem. Sending from Mac Mail seems to be Ok as well. I've checked the settings over and over. I received no system disk for this machine when I bought it. Do I need to reinstall Mail, and if so, how?
The info below from Connection Doctor shows it appears to be trying to access through Port 25 but I have Mail set for 587 as instructed by the hosting company. I have renamed private info in the text below.
READ Jan 16 09:56:42.941 [kCFStreamSocketSecurityLevelNone] -- host:mail.myemail.com -- port:25 -- socket:0x11f51aed0 -- thread:0x122c48a20
250-servername-a41.g.webhostname.com
250-PIPELINING
250-SIZE 40960000
250-ETRN
250-STARTTLS
250-AUTH PLAIN LOGIN
250-AUTH=PLAIN LOGIN
250-ENHANCEDSTATUSCODES
250 8BITMIME

However, Thunderbird and Entourage Mac have no problem. Sending from Mac Mail seems to be Ok as well. I've checked the settings over and over.
Well if TB and Entourage can both send and receive but Mail can only send I can only conclude you missed something in you rechecking. Of course with you being the only one checking you are going to make the same "mistake" and never no it. So post the relevant POP server info for your ISP (edit out personal info and passwords of course):
Account Info:
Incoming Mail server: pop server address
User Name:             required user name POP server is looking for (censor)
Password:              password required by POP server (censor)
Advanced:
Port:      995, 25, default?
Use SSL:   yes or no
Auth:      kind of authentication

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I've already used Process Explorer to analyze, but there are no open file handles.
To reproduce the problem: create two Server 2012 R2 machines and run the below code from one server accessing an SMB share on the other server.
Below is the code I use for testing, if you reproduce the scenario, I'm sure you get the same error.
We are not looking for an alternative way to solve this, but wonder if this is a bug that needs to be reported?
Anybody seen this behavior before or know what's causing it?
The code:
string file =
@"\\server\share\test.txt";
if (File.Exists(file))
File.Copy(file, file +
".bak", true);
File.WriteAllText(file,
"Testje",
Encoding.UTF8);
The error:
System.IO.IOException: The process cannot access the file '\\server\share\test.txt' because it is being used by another process.

Hi,
There is someone else having the same issue with yours. You could try code in the article below:
“The process cannot access the file because it is being used by another process”
http://blogs.msdn.com/b/shawncao/archive/2010/06/04/the-process-cannot-access-the-file-because-it-is-being-used-by-another-process.aspx
If you wonder the root cause of the issue, the .NET Framework Class Libraries forum can help.
Best Regards,
Mandy
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M
Sent from Cisco Technical Support iPad App

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Message was edited by: WZZZ

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http://support.apple.com/kb/HT2712
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Mail cannot access the mail server, but other email clients do.

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