When using an Outbound Mail account as a smart host for a mail server it's possible for the mail server to submit messages with a null envelope sender. When this happens, we will rewrite the null sender with the "Postmaster Email Address" configured in your account preferences.
This address should be set to the person or an alias for the person who is responsible for maintaining the mail servers under your account. If the postmaster email address is blank the primary email address will be used.
Old announcements before the Newspipe and Twitter.
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