What do SPF and DKIM mean for outgoing email settings?
SPF is short for Sender Protection Framework. SPF is an email authentication protocol that allows the owner of a domain to specify which mail servers they use to send mail from that domain.
DKIM is short for DomainKeys Identified Mail. DKIM is an email authentication method. This method is used to detect spoofed, or fake sender email addresses, (Spam/Junk)