I assume that you are asking about DB Mail If you selected MAPI email interface, the "from" is specified in your MAPI profile settings. MAPI client builds all headers including "from" part. Create different profiles using different sender's addresses in order to use different "from" parts. If you selected SMTP, the "from" = "sender" parameter in the mail_send function. If sender is specified SMTP interface inserts it into the header as "from" and "reply-to" If you selected Lotus Notes, the "from" is the email address of Notes client. Notes client builds all headers including "from" part. : How I can set filed "FROM" in E-mail header.
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