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

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?

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I haven't used Apple Mail with Yahoo.  Have you tried going to Yahoo's webmail page to upload and send the attachement?  Yahoo should allow for 25 MB attachments.  I've done it with Thunderbird.

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Mac OS X

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