[Rudism]

In my experience trying to send email from any address with something other than .com, .net, .org, and most 2-character country TLDs automatically counts against it by spam blockers to the point where users have to whitelist the address to see any emails (and even then they sometimes don't get them). Even newer three-character TLDs like .xyz are practically useless for sending emails.

[jdpedrie]

I've seen similar. In this case though, I'm only receiving so it's not a concern.

[packetlost]

I haven't had issues with my .dev domains, but I'll keep an eye out.