How do I add TXT/SPF/DKIM/DMARC records for my domain? - Domains - Namecheap.com
Create a DKIM TXT record
Trail Blazer Adding a DKIM Key to your domain's Txt Record & Validating your SPF/DKIM Configuration for Outbound Email Blasts --- <b>Greatly Improve Your Email Open Rates!</b> <i>(<span style="color:red">*</span>requires access to your
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email - Using a 410 character DKIM TXT record on namecheap - Super User