Not everyone needs "reach"¹. In my case, if Google blacklisted my domain, worst-case scenario would be a handful of people who wouldn't get my emails, and I'd have to reach them by other means. I'm actually dealing with this right now², except with AT&T instead of Google, and all that's lost is my ability to email my grandpa.
More realistically, even when Google "blacklists" a domain, it typically just means emails from it end up in spam. "Check your spam folder" is sufficiently disseminated advice-wise that it ain't really all that big of a deal in practice whether Google arbitrarily decides my mailserver doesn't look sufficiently legitimate. If Google's taking measures more extreme than sending emails to Spam, then it's almost certainly because the server operator is doing something horribly, horribly wrong - like "running an open relay" levels of wrong.
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¹: I'd go further and argue that any emails from domains operated by people who actually do care about "reach" probably should be rejected and/or sent to Spam/Junk - namely, because they largely are spam/junk. Hell, I'd go further than that and say that I know of precisely zero domains which both care about "reach" and refrain from sending junk mail. I do know of plenty of domains that think they're special snowflakes whose unsolicited marketing fluff emails are totally legitimate and not at all spam and therefore it's totally unfair that their "reach" metrics are below 100% because of those big meanies and their spam filters. Needless to say, I take their complaints about their "reach" with a Dell PowerEdge R750 sized grain of salt.
²: Actually more severe than the usual case with Google, since AT&T does outright refuse to deliver mail from servers it doesn't like - and despite mine appearing on no blacklists of any sort, and despite AT&T repeatedly denying in various support fora that it maintains any blacklist of its own, I get hard bounces from their servers, and complete silence when following the very support processes said bounce emails describe. Oh well.
More realistically, even when Google "blacklists" a domain, it typically just means emails from it end up in spam. "Check your spam folder" is sufficiently disseminated advice-wise that it ain't really all that big of a deal in practice whether Google arbitrarily decides my mailserver doesn't look sufficiently legitimate. If Google's taking measures more extreme than sending emails to Spam, then it's almost certainly because the server operator is doing something horribly, horribly wrong - like "running an open relay" levels of wrong.
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¹: I'd go further and argue that any emails from domains operated by people who actually do care about "reach" probably should be rejected and/or sent to Spam/Junk - namely, because they largely are spam/junk. Hell, I'd go further than that and say that I know of precisely zero domains which both care about "reach" and refrain from sending junk mail. I do know of plenty of domains that think they're special snowflakes whose unsolicited marketing fluff emails are totally legitimate and not at all spam and therefore it's totally unfair that their "reach" metrics are below 100% because of those big meanies and their spam filters. Needless to say, I take their complaints about their "reach" with a Dell PowerEdge R750 sized grain of salt.
²: Actually more severe than the usual case with Google, since AT&T does outright refuse to deliver mail from servers it doesn't like - and despite mine appearing on no blacklists of any sort, and despite AT&T repeatedly denying in various support fora that it maintains any blacklist of its own, I get hard bounces from their servers, and complete silence when following the very support processes said bounce emails describe. Oh well.