SmallDev's questions

This question is related to some software for schools and one part is for the schools to send information to students and parents. But all mail end up in Gmail spam folders. If i look at the google postmaster tools for the last 120 days it says this:

• User reported spam: 0%
• Ip Reputation: 100%, but only for one day. No other records
• Domain reputation: High (on top) but with one day falling down to medium (when the schools starts after holiday)
• Spam feedback loop: 0%
• Authenticated traffic: 100% (DKIM success rate, SPF success rate, DMARC success rate)
• Encrypted traffic: 0% (inbound tls rate)
• Delivery errors: 0%

Allmost like they just put it to spam because its a competitor to their own products.

(by some strange reason, when the school where my kids go to send a messages, they arrive at my private gmail inbox, but not for other parents)

Is it time to give up on using email and force the receivers to install an app?

I dont know what more to do to prevent the mail from going to spam. Any advice on what to do?

Theoretical question: Does google not like it when the user never visited the page (same domain name as used for the sender email address) and yet receives emails from it? (email etc is collected from schools and registered by them)

These technical requirements are met:

• SPF setup
• DMARC setup
• DKIM setup
• IP Reverse lookup to sender domain

It is only google sending the mails to spam

In the "old times" it was not recommended to use dynamic expanding disks in hyper-v. This create the issue of using very much disk space on the hyper-v host. (because we need allocate the space for the virtual disks)

I cannot find too much information about what is recommended today for windows server 2019.

What is recommended in 2021? Fixed disk size or dynamic expanding?

Extra information: The virtual server does not handle any big files. Only work with small size files (few kb, but many hundre thousands of them) if there is really no good reason for choosing fixed size, i want to convert all disks to dynamix expanding disks.