The sending mail server digitally signs email. The recipient uses the public DKIM key from DNS to verify that signature.
Which value should you enter?
| Record type | DKIM |
| Value | TXT value at selector._domainkey |
| TTL | Use the default value unless a provider specifies otherwise. |
What should you consider?
- Copy the selector, host name and key exactly.
- Keep long keys completely intact.
- After publishing, check whether the selector can be queried publicly.
DNS changes take time
After saving, an old value may temporarily remain in cache. Therefore, check not only in your browser but also with an external DNS checker.
Frequently asked questions
When will a DKIM change become visible?
This depends on the TTL and provider caches. The change is often visible within a few minutes, but old responses may be retained for longer.
Can I undo a DNS change?
Yes. Restore the previous value and save again. This correction may also temporarily be affected by DNS cache.
Do I need to change the TTL?
Usually not. For a planned migration, you can lower the TTL in advance so later changes are retrieved more quickly.
Still need help?
Email support@mosthosted.com and include your domain name, the required record and the value.