One email account won't stop spinning in Mac Mail

hi,

trying fix friends email problem.

on lion using mac mail.

has corporate email address, gmail address, , aol address
coming mail client.

recently, corporate email checking mail spinning ball of death when check email.

cause delays other email addresses when try check , seem clog entire mail client.

able login host webmail client , seems working out on end. email host has changed webmail interface.

disabled corporate email in preferences, reboot mail , other email addresses check mail lickety-split. enabled bad account , once again, spinning ball of email death.

have advice?

thanks

update:

though don't have access laptop minute, logged webmail , found in sent messages box 2 copies of email 24mb piece. really stuck out me got same spinning ball of death while waiting sent box load.

i'm thinking deleting 24mb files out of sent items solve problem, ... won't know why.

mail talking email server , syncing files between client sent box , host sent box , spinning forever trying work 24mb file?

have make sure deleted in proper order? (client host or host client?)

 

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