“OTHER SMTP”, no extra DNS Records?

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Hi,

We use WP Engine for web hosting but handle mailaccounts at a local IT company.
So we would choose “OTHER SMTP” and fill out our local SMTP host, username and password…when configuring our contact form.
We only handle a small amount of email through the site via contact form (perhaps 5-10/day).

Now, when emails are delivered through our form at WP Engine via “WP Mail SMTP” > “OTHER SMTP”,
will the recipents recognize this as a “normal” emaildelivery (same as sent through our desktop email client)?
or will the fact that the email, from the beginning was generated at WP Engine server play any part at all?

Am I right that, when using “OTHER SMTP” this way, there is no need for any extra DNS Records (SPF, DKIM…)?

Thanks!