Yes, espacially exotic tld. I have a ".email" domain name, and I get 2 to 3 instances a year of either rejected forms, or sneakier, just confirmation email that never come until I use a .com address.

▲ threeio 4 hours ago | parent [-]

I have a 3 character .com as my primary email... it gets rejected more often than I'd like... including at my bank :) I've got a longer more normal domain that I alias, but it annoys me none the less.

	▲	gerdesj 3 hours ago \| parent [-]
		Have you got this lot sorted out: `MX->A->PTR->A->MX SPF DKIM DMARC mta-sts - DNS and webpage` Also your IPs must be squeaky bum clean, ideally for several years. DNSSEC might help too. In the UK getting as far as DKIM is usually enough (plus clean IPs, even FTTC connections will work if static).