I am trying to use burst mode to send emails over sdifferent email addresses but it seems to only be using the 'default' account. I have set it up to use 6 email accounts all from the same domain.

example:
mailer1@domain.com
mailer2@domain.com
mailer3@domain.com
mailer4@domain.com
mailer5@domain.com
mailer6@domain.com

They all use the same error and reply to address, which is admin@domain.com. I'm watching the delivery tab while in progress and it only logs in to mailer1.

It never logs in to the other 5 accounts. Here is what I pulled from the delivery stats:

[01] 4/6 03:31:02 > AUTH LOGIN
[01] 4/6 03:31:02 334 VXNlcm5hbWU6
[01] 4/6 03:31:02 > mailer1@domain.com
[01] 4/6 03:31:02 334 UGFzc3dvcmQ6
[01] 4/6 03:31:02 > ********
[01] 4/6 03:31:02 235 Authentication succeeded
[01] 4/6 03:31:03 > MAIL FROM:<admin@domain.com>

The login is always mailer 1.
Each account is set to 1 connection.

From what I see I don't see how it could be using the other 5 mailers and no matter what I change it always only uses the one.

Am I missing something? Or is it actually working right?

Not all servers supports that, Gmail for example doesn't. I mean, using several accounts on the same server. Is you server Google?