> So many people don't take the 10 minutes to configure DMARC, DKIM and SPF.
Another commentator here mentioned this and the hint was worth gold. In the meantime, I changed/adjusted this in the interface of my website provider (I am also using his SMTP server) and solved an actual problem of this kind immediately (maybe also explaining the shortcomings in the past).
In general, I would admit that it is not a compelling excuse not to know something. The problem is, that I was not even aware of these keywords and after looking them up, I seemingly solved things quickly and - hopefully - permanently. People just don't constantly check all things. Especially with long term reliable services with rare, subtle and not obvious (in this case without any hint) errors.
Another commentator here mentioned this and the hint was worth gold. In the meantime, I changed/adjusted this in the interface of my website provider (I am also using his SMTP server) and solved an actual problem of this kind immediately (maybe also explaining the shortcomings in the past).
In general, I would admit that it is not a compelling excuse not to know something. The problem is, that I was not even aware of these keywords and after looking them up, I seemingly solved things quickly and - hopefully - permanently. People just don't constantly check all things. Especially with long term reliable services with rare, subtle and not obvious (in this case without any hint) errors.