SV: said: 421-4.7.0 This message does not have authentication information

[Sebastian Nielsen]

You need to set up either SPF or DKIM, so GMAIL can detect spoofed mail. I
would recommend SPF, its easiest.

 

Just add the following to your DNS:

@ IN TXT ”v=spf1 ip4:<YOUR EXTERNAL MAILSERVER IP> -all”

(repeat the ip4 command if you have multiple servers, ip6 is for IPv6)

 

Or:

@ IN TXT ”v=spf1 mx -all”

 

If your incoming server(s) is same as your outgoing.

 

Från: owner-postfix-us...@postfix.org
[mailto:owner-postfix-us...@postfix.org] För Motty Cruz
Skickat: den 30 september 2016 00:49
Till: postfix-users@postfix.org
Ämne: said: 421-4.7.0 This message does not have authentication information

 

Hello, I see the following errors on SMTP server logs: 

 

E7AA017645      556 Thu Sep 29 15:43:13  us...@fqdn.com
<mailto:us...@fqdn.com> 

(host alt1.gmail-smtp-in.l.google.com[74.125.69.27] said: 421-4.7.0 This
message does not have authentication information or fails to pass 421-4.7.0
authentication checks. To best protect our users from spam, the 421-4.7.0
message has been blocked. Please visit 421-4.7.0
https://support.google.com/mail/answer/81126#authentication for more 421
4.7.0 information. o78si810588ita.33 - gsmtp (in reply to end of DATA
command))

 

We are not spammers, we’re legitimate, full qualify domain name. Any ideas? 

 

Thanks,
Motty

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