Each time you successfully check your email, your full 30 minute 'send window' will be refreshed. It is not capable of receiving email.

If you run into limitations as a result of this overhead, you might try using ftp instead to transfer large files. Even though I have only one real domain and one virtual alias domain, the steps are the same if you have two mailbox domains, or twenty. Each time you successfully check your email, your full 30 minute 'send window' will be refreshed.

How would I go about getting it like this?:. This file tells opendkim, about all the domains you want to sign and where to find their keys: