gmail... toxic for internet now. But gmail toxicity is only the tip of the iceberg.
I remember when I had a gmail account, when they did shutdown the classic web view (noscript/basic (x)html) to force people to use one of the "whatng" web engines. No netsurf/links2/lynx anymore... wow, what a bunch of animals.
Then I moved to being self hosted (soon on RISC-V hardware of course, at the time, I could get my hands only on arm hardware, sad), then I lost my domain name. Of course the geniuses over there did the same thing than the animals at gogol: they broke classic web support (noscript/basic (x)html). Now, to pay for and book a domain name, you must have one of the "whatng" cartel web engines. Wow, geniuses indeed. Not even able to understand why there is an issue at depending on one of the massive and ultra-complex "whatng" cartel web engines.
To add insult to injury: spamhaus. Basically, if you do not "pay them", you are in their blocklist which many ultra-skilled sysadmins use without thinking twice, trusting those lists blindly. Of course, spamhaus is a nice "company" based in andore and switzerland... who said shabby as f?
Then, the email standard designers were careful to have "no DNS" support with IPv[46] literals (which is stronger than SPF, since emails, their envelop and header, referencing a SMTP server with a different IPv[46] can be dropped without further processing). gmail is forbidding its users to send to such email addresses, and when you try to send to gmail such emails from such SMTP server, they block them due to the IPv[46] literal. The bottom of the barrel of humanity.
They are turning internet into a new compuserve/aol. This is pure evil.