If your Sender email ID has not appearing in the sender field ind send mail option | Email SMTP Server Configuration

If your Sender email ID has not appearing in the sender field.

Address Spoofing:
Email spoofing is email activity in which the sender address and other parts of the email header are altered to appear as though the email originated from a different source. Because core SMTP doesn’t provide any authentication, it is easy to impersonate and forge emails.

Options You can select when you configure SMTP Connector
Authenticated senders can impersonate:

If this is selected, users who are authenticating to send email do need to use a valid email address when sending via an email client.

Authenticated senders cannot impersonate:

If this is selected, users who are authenticating to send email must configure their email client with a valid email address that is assigned to the mailbox they are using to send on. This option is useful to force clients to use a legitimate email address, thereby reducing the possibility of spam.

Privileged IP addresses can impersonate:

If this option is selected it will allow any privileged IP address within the SMTP privileged IP’s list to impersonate when using an invalid email address. This option is useful for web pages that send via the MailEnable SMTP service using an email address that does not reside within MailEnable.

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