Help with GMail...

[Grant Taylor via NANOG <nanog () nanog org>]

Hi,

I was wondering if there were any GMail contacts on NANOG that might 
contact me either on or off list for some help.

I am having problems sending email to GMail from my new (< 2 weeks old) 
Linode VPS.

    tncsrv06.tnetconsulting.net (IPv4: 45.33.28.24, IPv6: 
2600:3c00:f03c:91ff:fe26:8849)

I have forward and reverse DNS set up as well as following all of the 
same practices that I have used to administer email servers for the past 
15 years. So, I think that I have everything covered.  (If I've missed 
something, let me know and I'll take care of it.)

Is there a chance that my IP address(es) (v4 and / or v6) have been 
blocked because of previous IP user actions?  Or am I by chance part of 
a netblock that is black listed?

Below is the multi-line SMTP response that is showing up in the DSN that 
I'm receiving.

<<< 550-5.7.1 [2600:3c00::f03c:91ff:fe26:8849      12] Our system has 
detected that
<<< 550-5.7.1 this message is likely unsolicited mail. To reduce the 
amount of spam
<<< 550-5.7.1 sent to Gmail, this message has been blocked. Please visit
<<< 550 5.7.1 https://support.google.com/mail/answer/188131 for more 
information. f5si4126138oeo.56 - gsmtp

Any help or suggestions you could provide would be greatly appreciated. 
I'm in the process of migrating off of my old server to my new Linode 
VPS as part of a move and would like to get this quickly, if possible.

As a temporary work around, I have routed gmail.com email to my other 
Linode which can send email to GMail.

    tncsrv05.tnetconsulting.net (IPv4: 109.74.192.125, IPv6: 
2a01:7e00::f03c:91ff:fe89:2935)

Thanks for your time and any help you can provide.



--
Grant. . . .
unix || die


P.S.  I did send an email to postmaster () gmail com, but it bounced saying 
that the address had been disabled.

> <postmaster () gmail com>
>     (reason: 550 5.2.1 The email account that you tried to reach is 
> disabled. n5si4180778oib.56 - gsmtp)