Sendmail

The Deluge Sendmail command has the option to set the mail's From address. Many mail clients (e.g. Thunderbird) will now reject emails whose From addresses are spoofed (to protect against phishing attempts), would it be possible to have an option to register an email account against your domain (e.g. myzohousername@zohocreator.com) to counteract this. This email account would also need the ability to redirect any replies to another address.

On the subject of phishing, you should probably verify an email address before it could be used by the sendmail command (this is what GMail does before it will spoof an address). If a phisher started using your service you could find your domain or IP addresses put on black lists.

Tom