"Gmail does not, inherently, have any network effects" - you do and you can't help it.
I've been doing email for quite a while (20 odd years) and I don't find Gmail refusing my customer's email for silly reasons too often.
I have had some odd rejections from Gmail (int al) and no-one to talk to. You opine that Postmaster tools are under-invested in but actually miss the real point:
You (G) seem to under-invest in people and put too much faith in magic (AI/ML/nonsense). I really am not a Luddite (I'm giving the tyres on my smart new Node-RED home IoT thingie a good talking to via Javascript right now) but please don't forget ... "memento homo")
"Gmail does not, inherently, have any network effects" - you do and you can't help it.
I've been doing email for quite a while (20 odd years) and I don't find Gmail refusing my customer's email for silly reasons too often.
I have had some odd rejections from Gmail (int al) and no-one to talk to. You opine that Postmaster tools are under-invested in but actually miss the real point:
You (G) seem to under-invest in people and put too much faith in magic (AI/ML/nonsense). I really am not a Luddite (I'm giving the tyres on my smart new Node-RED home IoT thingie a good talking to via Javascript right now) but please don't forget ... "memento homo")