I have what I'm hoping is a very simple issue/question. I am running zimbra Release 8.0.1.GA.5438.UBUNTU12.64 UBUNTU12_64 FOSS edition on a hobby linode (just pointing out this is non production).

I've added my zimbra user email account to my iPhone (connecting via IMAP). However whenever I try to send email from the iPhone I see the message:

"Cannot Send Email

The connection to the outgoing server "mail.mydomain.com" failed. Additional Outgoing Mail Servers can be configured in Settings -> Mail, Contacts, Calendars."

For both settings Host Name and SMTP on the iPhone I have the same setting: mail.mydomain.com

The zimbra instance on the web functions perfectly, and I'm wondering if I need to set any additional settings to get this to work. I'd also like to get a mutt config working with my zimbra server which I plan to post about separately, but I'm guessing the issues I'm having may be related.