I added them after I noticed problems really. Postfix and Dovecot have somewhat of a learning curve (I started up and trashed a few VM's before I got it right).

I added them after I noticed problems really. Postfix and Dovecot have somewhat of a learning curve (I started up and trashed a few VM's before I got it right). I ended up using IRedMail, the defaults are pretty much Gmail ready. I don't know about prior messages counting against you, given what I've seen it seems to makes sense. Without insider info we can only speculate.