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Does it happen all of the time or are there times when it works OK? &nbsp;<br />
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I have something similar going on running under 10.5. &nbsp;As far as I can tell, the password is fine and is being saved OK. &nbsp;In my situation, the password problem doesn't happen all of the time. &nbsp;In fact I can go for days without this happening. &nbsp;But then it will start and it might happen for several hours. &nbsp;I've had it explained that it's most likely my ISP just not taking the password like it should; like it just isn't making the connection properly. &nbsp;I was attempting to retrieve my email every &nbsp;couple of minutes and it was suggested that I change that to a longer time frame. &nbsp;That seems to have helped, but has not eliminated the problem.<br />
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Basically I am living with it.
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Does it happen all of the time or are there times when it works OK?  

I have something similar going on running under 10.5.  As far as I can tell, the password is fine and is being saved OK.  In my situation, the password problem doesn't happen all of the time.  In fact I can go for days without this happening.  But then it will start and it might happen for several hours.  I've had it explained that it's most likely my ISP just not taking the password like it should; like it just isn't making the connection properly.  I was attempting to retrieve my email every  couple of minutes and it was suggested that I change that to a longer time frame.  That seems to have helped, but has not eliminated the problem.

Basically I am living with it.

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Client accepted explanation
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We have a user running OS X 10.4.11 and the Mail keeps asking for a password although the password has been saved in preferences and is also listed in the keychain as we have checked. &nbsp;We constantly have to enter the password and eventually it takes. &nbsp;What would cause this? &nbsp;For some reason now that the user has an iphone it is occuring more than usual.
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We have a user running OS X 10.4.11 and the Mail keeps asking for a password although the password has been saved in preferences and is also listed in the keychain as we have checked.  We constantly have to enter the password and eventually it takes.  What would cause this?  For some reason now that the user has an iphone it is occuring more than usual.

OS X Mail keeps losing password for checking email although stored in keychain

Mac OS X is the desktop operating system from Apple Inc., found on Macintosh computers. OS X consists of a Mach/BSD-based kernel, operating system interfaces primarily based on FreeBSD and additional frameworks (written in C, C++ and Objective-C providing user interface and application-level services.

Mac OS X

An email client, email reader or more formally mail user agent (MUA) is a computer program in the category of groupware environments used to access and manage a user's email. A web application that provides message management, composition, and reception functions may internally act as an email client; as a whole, it is commonly referred to as webmail. Likewise, email client may be referred to a piece of computer hardware or software whose primary or most visible role is to work as an email client. Email clients can also have other systems, like calendars, notes and contact managers.