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it seems the emails of my client are always landing in my Spam folder. I suspect his DKIM TXT record is missing (or even the subdomain at all). I would like to validate this before suggesting help on that matter. He is not very tech-savvy, so he won't know it (anymore), probably.

My question is: Can I find the DKIM selector from his domain by my own? If so, how?

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  • Don't you have access to your clients zonefile or some UI or API access to be able to see all their records? Because otherwise you can not find the specific TXT record, besides testing some heuristics or having access to some email that ought to have used it. – Patrick Mevzek Feb 25 at 4:17
  • I closed this because it appears to be about debugging email sent by somebody else and not about running your own website. – Stephen Ostermiller Feb 25 at 11:36
  • @StephenOstermiller Ok, out of curiosity, what StackExchange site would've been the right to ask this? – Martin Braun Feb 25 at 22:17
  • @PatrickMevzek I have not, thanks for clarifying. – Martin Braun Feb 25 at 22:18
  • I don't know of a Stack Exchange site that would be appropriate for this question. – Stephen Ostermiller Feb 26 at 9:37
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I assume your client has sent an email to you at some stage, in the headers search for ‘DKIM-Signature’ to find the DKIM signature applied to the message.

This DKIM-Signature contains an attribute ‘s=’ which is the selector used.

You could always try default as the selector and test it here: https://easydmarc.com/tools/dkim-lookup

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  • Thanks, this was helpful and I decided to mark your answer as accepted. It appears there is no DKIM signature and I could pin point that even an SPF entry is missing, so no wonder all his emails are treated as spam. I could convince him to help him out on that matter. Anyways, have a nice day, Steve. – Martin Braun Feb 25 at 22:20

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