So, to better understand my Apple Mail problems under Mountain Lion DP2, here is how my perfectly working email is set up under LION: I have a Mac Mail account as a primary account set up under iCloud. However, since I have a more prominent email address with Verizon, I send all my mail out through my Verizon SMTP address. Works perfectly. You would think that once I upgraded to Mountain Lion DP2, all my settings would successfully translate over to the new Apple Mail and that everything should work. Not so. I was able to receive my mail fine. Problem was sending. Every time I replied to an email, I got an error about TLS and a port address. Wished I had copied and pasted the entire message. Anyhow, went to Verizon Fios' website and made certain I had port addresses correct for their SMTP account, but alas, mail would not send out. In the end, I took out Mountain Lion DP2 and restored my drive to Lion. It's a shame because DP2 looked to be very stable and all my applications seemed to work fine under it including Photoshop CS2 and Snapz X Pro. Anyone have similar problems with email?