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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.