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Mail from single-droplet getting unauthorized failures from reipient mail servers
I have a single droplet running my application, and hosting a postfix mail server for sending notifications, etc. However, mail is not working.
When I run a cmd-line test mail to a gmail account, I get a rejected response:
“The IP you’re using to send mail is not authorized 550-5.7.1 to send email directly to our servers. Please use the SMTP relay at 550-5.7.1 your service provider instead.”
In terms of DNS record set-up:
A records are fine for site and mail subdomain, as verified by whatsmydns.net.
MX record also verifies (now using main domain)
I have three TXT records as follows:
main site: v=spf1 ip4:xxx.xxx.xxx.xxx -all
mail._domainkey subdomain: “v=DKIM1;h=sha256;k=rsa;p=…”
_dmarc subdomain: v=DMARC1;p=quarantine
The DKIM above matches my public/private setup, as per the DO “How To Install and Configure DKIM” tutorial.
I do receive email, I just cannot send any. Help appreciated!
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