As others have admitted on the forum, I am new to the business of servers. I have set up sites using virtual hosts and had a VPS with another provider. I have recently moved to Lunarpages because of my positive experiences with their virtual hosting services. Frankly, for the simplicity of the sites that I host, a lot of server knowledge hasn't been required. Now, however, I seem to have run into a snag.
I successfully migrated my domains to the new server, took care of my nameserver registration and thought that all was right with the world when I saw my sites from their new home. Even the databases work! So far, so good.
Email, however, has proven to be a different matter. I cannot log in (using webmail) to any of my email accounts. This includes both those that I have migrated as well as new accounts which I have created on the new VPS. My mail clients are unsuccessful at retrieving mail as well, with the exception of one domain. On that domain, I can receive mail, but I cannot log in to webmail.
Additionally, sending mail to any of my domains results in various errors:
- 550 sorry, no mailbox here by that name
- 554 Destination server rejected recipients
- 553 sorry, that domain isn't in my list of allowed rcpthosts
I think that it is the inconsistency of things that baffles me more than anything else. Why don't I get the same error message for each domain? Why does one domain handle mail while the others do not? Why can I receive mail via a mail client, but yet I cannot log in to the same account via webmail?
Do I simply need to wait longer for the propagation? Or are there server settings which still need to be configured?
Of course, I have opened a ticket but we know that help is not always as speedy as we would like.

And my clients need their email.
Any help would be greatly appreciated. I am afraid that I am swimming over my head here.