If you’re using Google Workspace, Google will give you the appropriate DMARC, DKIM and SPF records to add to your DNS. The NS themselves should resolve the records and provide the recipient server with the values you’ve entered, thereby ensuring delivery.
Sure. But why would that matter when you're dealing with hostile 3rd party email providers that intentionally want to blackhole all email domains at Namecheap? But yes, just to clarify I do configure DMARC/DKIM/SPF and that works great for most cases.
I'm just describing what worked for me though in truth I don't know exactly how these hostile email providers actually determine the domain is hosted at Namecheap. My hunch is that they are using a lookup & finding the nameserver for the domain & have already blacklisted Namecheap's default free nameserver IP addresses. For whatever reason those same hostile email providers don't seem to be blacklisting Namecheap's paid nameserver but I think that sort of makes sense...
The larger issue is that Namecheap is known for cheap domains that scammers/spammers tend to buy in bulk & then use to spam with. Those same scammers/spammers aren't trying to spend extra money so they only ever use the default free Namecheap nameservers.
Yeah I thought that too but when speaking with the email admin that was blocking Namecheap while figuring this out they had already decided it wasn't worth trying to allow the 1% of valid emails vs the 99% spam emails they felt they received via Namecheap domains.
Smear against whom? I'm a Namecheap customer, just relaying my own experiences using them. Besides that quirk I like them fine as a registrar.. I know it sounds dumb but I even renewed my domains there even after those email issues.
It's fine, you don't need to believe me as I said it's just my own experience using Namecheap domains for emails. But you could just google around, you'll see plenty of people discussing Namecheap & looking for solutions to block them (or solutions to successfully send emails with hem).. it's not something I randomly made up if that's what you're implying.
e.g.
https://community.spiceworks.com/t/blocking-emails-based-on-registrar/816565
https://tacit.livejournal.com/608386.html
https://shkspr.mobi/blog/2021/05/why-do-scammers-love-namecheap/
https://www.reddit.com/r/NameCheap/comments/13t6fvm/namecheaps_private_email_is_blacklisted_by/
https://www.reddit.com/r/NameCheap/comments/wlb6vp/namecheap_making_it_too_easy_to_register_domains/
https://www.reddit.com/r/NameCheap/comments/tz4mkb/my_emails_are_always_going_in_the_spam_folder_of/
https://www.reddit.com/r/NameCheap/comments/ye358x/i_am_getting_a_ton_of_spam_scams_from_namecheap/
etc.