Do not look at the sender email address. That is fake anyways and is how it tricks users.
Look at the header of the email message. In the header you can see the real email server that sent that message and its IP and all other technical details.
Usually in any email client, open the message and in properties you can see all the header info.
Anyways strong DMARC, DKIM and SPF records must be implemented for any email domain you are running so most of email clients could reject phishing emails from the start.
I was looking into getalby.com domain MX records using
https://mxtoolbox.com
(very good tool to configure properly your email server) and I found these rules used for anti-spam and anti-phishing rules: