11. marts 2021

SPF for domains der IKKE skal sende e-mail

 When it comes to email deliverability, most people are trying to figure out how to ensure their mail lands in the inbox. But what if you want to tell email providers that they should not accept email from a domain name? This might be the case if you have a parked domain that someone is trying to spoof when it sends email.

One option is to create a Sender Policy Framework (SPF) record that says all mail should be rejected. To do this, go to your domain name registrar and manage the DNS for the domain.

Create a TXT record and include this text:

contoso.dk TXT "v=spf1 -all"

This will tell mailbox providers that your domain name should not send any email, giving them an indication that email with your address should be considered spam.

Domain name owners should consider adding SPF records to their parked domains if they don’t use them for email.




DKIM for domains der IKKE skal sende e-mail

Identify domains that do not send email

Organizations should explicitly state if a domain does not send email by specifying v=DKIM1; p= in the DKIM record for those domains. This advises receiving email servers that there are no valid public keys for the domain, and any email claiming to be from that domain should be rejected. You should do this for each domain and subdomain using a wildcard DKIM.

For example, the DKIM record would look like this: (TXT record !)

*._domainkey.SubDomainThatShouldntSendMail.contoso.com. TXT "v=DKIM1; p="


MX Toolbox Supertool - DKIM



10. marts 2021

WAN IP

 Hvad er min WAN IP adresse?

Windows Defender bør fjernes fra Server 2016/2019, hvis der er anden Antivirus installeret



Kør fra Administrator CMD prompt :

Dism /online /Disable-Feature /FeatureName:Windows-Defender /Remove /NoRestart /quiet


Enable or Disable Windows Features Using DISM

https://docs.microsoft.com/en-us/windows-hardware/manufacture/desktop/enable-or-disable-windows-features-using-dism

Outlook vil ikke åbne vedhæftede filer

 Der kan også være problemer med at tilføje signatur

Tilføj til registry :


HKEY_CURRENT_USER\Software\Classes\.html.