Mail doesn't get connected to an IMAP server

Hi folks. I use Maill.app with several accounts based on imap servers, but i had to create a new one (in a new profile) and can´t get connected (it said that never found internet).
The strange thing is that i did it on another Mac and worked without problems (with Mail.app) and in my machine did it with Thunderbird and worked perfectly.
When i asked netstat about the connections, with mail nothing appears, but with Thunderbird shows inmediatly the IMAP connection.
If i do a telnet to the server and port 143, ther server answer in less than a second.
I'm connected by a proxy server, but i reach the server without problem (the other mac where i tried earlier also is behind the proxy and works perfectly)
Any ideas about it?

Have you tried power cycling your Wi-Fi acces point or router?
Sometimes they get devices "stuck" in them and will not allow the device to reconnect.
You might also want to try temporarily disabling the security on the Wi-Fi to see if that will allow your iPhone to connect.

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Reboot the phone by holding the HOME and SLEEP buttons at the same time until an Apple logo appears
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I'm using Mail.app to connect to our local IMAP server (over SSL). For a long while, I've had problems with large attachments being corrupted when I open a message in Mail. If I view the same message in our webmail client (which also talks to the IMAP server), the attachments are uncorrupted.
If I save a message as source and decode using a mime64 decoding tool, the attachments are corrupted in the same way as from within mail. This is most clearly visible when the attachment is a large jpeg.
If I remove the locally cached messages by deleting the /Library/Mail/IMAP-xxxxx folder, then re-download all the messages, the attachments will be often corrupted in a different position in the image.
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The right way of doing that would be rebuilding the
mailbox, i.e. select it and do Mailbox >
Rebuild. Does that make a difference?
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Another thing to try would be trashing the Mail
cache, i.e., quit Mail, in the Finder go to
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/Library/StartupItems/
Empty.
/Library/InputManagers/
SIMBL
~/Library/InputManagers/
Empty.
/Library/Mail/Bundles/
Empty.
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GPGMail
Mail.appetizer
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there?
LittleSnitchDaemon
iCalAlarmScheduler
iCal
Mail
SmartReporter
LiteSwitchX
MicrosoftMouseHelper
MouseLocatorAgent
Skype
Last.fm
Renicer
The items below the line have been added recently, and the problem was definitely there before hand.
Dylan.
Powerbook G4 Mac OS X (10.4.8)

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Mail doesn't get connected to an IMAP server

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