Because apparently we need a PhD in email delivery to send emails
Congratulations on your impressively detailed abuse email!
"This system has not sent any e-mail to our customers for a long time. For security reasons our systems will only accept e-mails from such IP addresses after a check of setup and information about these systems."
That's... interesting. Perhaps your spam filters are a bit too enthusiastic?
Including how we acquired email addresses? That's... thorough. We'll get right on that.
We're impressed by your technical standards. We'll be sure to polish our DNS records until they shine.
Because nothing says "professional email delivery" like a website address in an IP address field.
We're thrilled to comply with your extensive requirements. We'll be sure to send our detailed information via carrier pigeon, as that seems to be the most reliable method according to your standards.
Thank you for keeping the internet safe from... email deliverability.
* This banner was created with sarcasm and a healthy dose of disbelief *
Christopher Bleckmann-Dreher
Muehlstr. 6, 74388 Talheim, Germany