[Design] [Proposal] Decoupling In/Outbound mail accounts

[Mimi Yin]

We want to allow people to easily send out invitations in 0.7 without  
having to:
+ fill out incoming mail account information, thereby
+ sending Chandler into the throes of trying to download your email  
into the repository.

Currently, if you fill out the SMTP account information, you have to  
fill out Incoming mail account information as well (so that there's a  
reply-to email address for outbound mail.)

Here are a couple of proposals for how we might de-couple incoming  
and outgoing mail accounts in 0.7:

+ Add a "Reply to:" field to the SMTP account form. Allow users to  
send email by just filling out Outbound mail information without an  
Incoming mail account. AND/OR

+ Unify Inbound and Outbound mail account info into a single Mail  
account. Users can optionally fill out the incoming mail server. AND/OR
+ Add a checkbox to the mail account form that is un-checked by  
default: Sync automatically.

Mimi