Let's say that I have a server that resides at Linode that I use for my business,
mybusiness.com. It has an IP Address of
126.96.36.199, and an A record of
myserver.mybusiness.com. I own the domain name and host my DNS through DNSimple, and everything at this point works fine.
As a part of my business, I have a contract with
othercompany.com. They control their own domain name, and someone else runs their DNS for them.
For this contract, I need to send emails as "them" (
firstname.lastname@example.org) from a process that is running on
Myserver currently has Jenkins (for running the jobs) and Exim (for sending the emails) installed on it. We don't control the email addresses we're sending emails to; they're our clients' email addresses. Some of them are Google.
This was working fine for nearly a year. About a month or so ago, we started noticing bounces most specifically from GMail. Comcast has always presented a problem for us sending email as well.
SMTP error from remote mail server after end of data: host aspmx.l.google.com [2607:f8b0:400c:c06::1a]: 550-5.7.1 [2600:3c03::f03c:91ff:fe73:138] Our system has detected that this 550-5.7.1 message does not meet IPv6 sending guidelines regarding PTR records 550-5.7.1 and authentication. Please review 550-5.7.1 https://support.google.com/mail/?p=ipv6_authentication_error for more 550 5.7.1 information. h1si10102273ywc.225 - gsmtp
So the first question I have is...Who should set up PTR and/or SPF records so that
myserver.mycompany.com can properly send emails as
email@example.com and have places like GMail and Comcast accept those emails? Is it me (through my DNSimple account), or is it the company that controls their DNS? And secondly, what should those record(s) look like? Thanks!