@Tak @Paul_Taylor
And 70% of spam is from them (Gmail and Microsoft).
I created dozen of mailbox at Gmail and Microsoft to test email reception.
- They flag them as spam even if there was previously exchanges (but less often in this case), even from Gmail or Microsoft.
- They randomly delete messages too, without notification, for no reasons.
Using big mailers like mailgun or others can be worse many times.
I have far more better receptions from my own mails servers or other smallers providers