My environment: hMailServer 5.6.8 on Windows Server 2022 Standard
Let's say I have two domains (I don't really own these domains, they're just examples), www.myblog.com and www.mailserver.com. They are both hosted on the same machine and have the same IP address 1.2.3.4.
The blog site www.myblog.com uses www.mailserver.com to send emails. The site www.mailserver.com only serves as a mail server; it is not accessible from a browser. I have set it up so that when www.myblog.com sends an email to someone, the recipient's email server receives SENT: EHLO www.mailserver.com, but sees SENT: MAIL FROM:<[email protected]> message, so the recipient sees that the email came from myblog.com.
Like mentioned before, the current EHLO message is SENT: EHLO www.mailserver.com
Everything is working fine so far. Recently I decided to check the "spam rating" of my setup at https://www.mail-tester.com. I sent an email to the spam tester using the setup described above, and I saw a warning under the SpamAssassin section that says
SPF_HELO_NONE SPF: HELO does not publish an SPF Record
My question is, how do I get rid of this warning? Are the DNS records as they should be? See below for the DNS records for each domain.
The DNS records for each domain are as follows (note the PTR record for 1.2.3.4):
IP address 1.2.3.4
PTR www.mailserver.com
myblog.com
Name Type Value
@ A 1.2.3.4
* A 1.2.3.4
@ MX 10 myblog.com.
@ TXT v=spf1 ip4:1.2.3.4 ~all
dkim._domainkey TXT v=DKIM1; t=s; k=rsa; p=[super long public key string]
mailserver.com
Name Type Value
@ A 1.2.3.4
* A 1.2.3.4
@ MX 10 mailserver.com.
@ TXT v=spf1 ip4:1.2.3.4 ~all
