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Mac OS X 10.9.x ? &nbsp;(have to check) <br />
Using Yahoo with Apple's Mail program.<br />
On Friday, there was a .PDF attachment of about 2.5 MB that just couldn't be sent. &nbsp;When I looked at the Activity window, I saw that the message would not go past the 46% sent indicator.<br />
<br />
I restarted the Mail program, and used MainMenu Pro to &quot;Vacuum Apple Mail Index&quot;<br />
It still wouldn't go past 46%<br />
<br />
Any known reason why this occurred?<br />
<br />
Thanks.
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Mac OS X 10.9.x ?  (have to check) 
Using Yahoo with Apple's Mail program.
On Friday, there was a .PDF attachment of about 2.5 MB that just couldn't be sent.  When I looked at the Activity window, I saw that the message would not go past the 46% sent indicator.

I restarted the Mail program, and used MainMenu Pro to "Vacuum Apple Mail Index"
It still wouldn't go past 46%

Any known reason why this occurred?

Thanks.

Yahoo on Mac Mail freezes at 46% when sending 2.5 MB attachment

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.

Email Clients

An email client, email reader or more formally mail user agent (MUA) is a computer program used to access and manage a user's email. A web application that provides message management, composition, and reception functions is sometimes also considered an email client, but more commonly referred to as webmail.