Using 5.06 Network Edition, I cannot send mail using an alias via the web interface.

I click new and select the account compose my message and send it.

I check the sent message source and find it was sent from

Click on preferences -> accounts. 2 accounts are listed, both as personas. Both have a status of ok. Other details all look correct.

So, question is, how on earth do I get the web client to let me send mail as AND ???

Any suggestions would be appreciated!