I find it frustrating that when you set up an email account, you only have to imput the password once, and it will store it for the IMAP and the SMTP servers. However, if you change your server information, and re-enter your password, it only stores it for the IMAP and waits until you need to actually send an email before it asks for the exact same password. If it's a day or two before you actually send an email from that account, you may not have the passwords in front of you anymore.
My suggestion is that when you change a server setting, and re-enter your password, that it saves it for BOTH the IMAP and SMTP. It's frustrating as I've had to change servers a couple of times with my host. Likewise, anyone who changes web hosts and has to modify their server settings has to jump through the same double hoops.
Also, it would be great to have the option to REMOVE the password for your old server. Otherwise the Password Manager gets cluttered up with dead, redundant passwords that have to be manually removed later.
Addendum: Not only do you have to change all of your server passwords, but it also removes the account from all of the "Unified" folders, so you have to go in and manually add it back into any/every "Unified" tab you want to use. Is there a practical reason for this?