XF 2.2 Do we need to enable this?

[beerForo]

If DKIM is enabled at the server lever, does this need to be enabled in XF?

DKIM email authentication
Enable
DomainKeys Identified Mail (DKIM) is a method of email authentication to detect forged sender addresses which are often used in phishing and email spam. DKIM allows the receiver to verify that an email claimed to have originated from a particular domain was authorised by the owner of that domain.

Note: You can only enable this option if you have the openssl extension installed and enabled.

 

[digitalpoint]

If DKIM is handled at the MTA level (like Postfix), you don't need it at the application level (XenForo). You can sign outgoing emails multiple times (like XenForo could sign it and then Postfix could sign it also), but it's not necessary under normal circumstances.