I spent some years in England, I liked the way people there react to queue jumpers and bullies. Gmail with all its monopoly over emails on Android, is indirectly forcing other email domains to register for its services. Gmail blocks some emails from reaching Gmail registered email accounts on pretext of spam and wrong email domain server configuration. Definitely no one is interested in receiving unsolicited junk mail and while Gmail representatives are doing all what is in their powers to curb this unacceptable trend, innocent by-standers are being caught up resulting in disruption of their activities. Long gone are the days when IP addresses were given to nearly everybody, if you are an individual with modesty use of Internet a simple website hosting is all you need on a fairly priced shared IP address with little control/access over configuration data. It is these shared addresses whose emails are not reaching the big and mighty servers. I cannot even reach my students using my own email.
Can’t Gmail staff come up with a verification process that doesn’t require registering with them? It is like you have got a problem with another person and you would like to iron it out. On contacting the other party, you hear, let’s meet in my restaurant to solve the issue amicably. Of course, toilet facilities will be free but should you feel like eating something you must buy. Such an approach is not bad, if you have an upper hand over others but it is unfair. Well it just like a pharmaceutical company overcharging on a rare but popular drug, you are left without an alternative but to buy. Bad business!