Given multi-tenant application, How are vendors implementing email notifications from an email account setup and programming perspective:

Sending emails could come from a generic account: eg [email protected] or [email protected], this seems reasonable considering reply addresses and lilnks can be contained within the email contents.

Receiving Emails: How would an application receive email, for instance; to generate support tickets or assign comments in an email to a project/task. I have seen ID's within the subject and some reply to addresses containing the account name eg: [email protected]

I realise one can programatically connect to a pop3 server and receive emails and look for the IDs with the subject, but is there a way of setting up and receiving email to a single pop3 account from multiple sub-host name email addresses (not sure on terminology there) eg: [email protected] or [email protected] and check the Account Name from the address? (similar to checking subdomains on a URL)

Any practices, experience, comments or sughestions?

(not sure its relevant, but using C# asp.net-mvc and services etc)