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I doubt it’s because it’s a competing service and it’s more likely because it’s a .io TLD… which is notorious for being used by phishers, spammers, and scammers unfortunately.
I doubt it’s because it’s a competing service and it’s more likely because it’s a .io TLD… which is notorious for being used by phishers, spammers, and scammers unfortunately.
https://answers.microsoft.com/en-us/outlook_com/forum/all/io-domain-spam-emails-out-of-control/6206daee-e035-4986-8d27-4c7d248a3350
I have sent an email to my gmail from an io domain with no issue… it took a lot of server side configuration though.
Not so sure about that, a quick search through my emails reveals emails from mend.io and codesandbox.io that had no trouble getting to me.
That said, I have found that even some sites that have .io don’t have it in their emails, they use a slightly different domain.
So maybe some sites have been whitelisted or it’s one of many heuristics Google uses.