On Wed, 6 Mar 2024, Michael W. Lucas via mailop wrote:

Hi,

First time playing with MTA-STS.

I have a test domain, ratoperatedvehicle.com. The mxtoolbox check says
everything exists:

https://mxtoolbox.com/SuperTool.aspx?action=mta-sts%3aratoperatedvehicle.com&run=toolpage

My reports from Google say they can't find it, however.

{
 "organization-name": "Google Inc.",
 "date-range": {
   "start-datetime": "2024-03-05T00:00:00Z",
   "end-datetime": "2024-03-05T23:59:59Z"
 },
 "contact-info": "smtp-tls-report...@google.com",
 "report-id": "2024-03-05T00:00:00Z_ratoperatedvehicle.com",
 "policies": [
   {
     "policy": {
       "policy-type": "no-policy-found",
       "policy-domain": "ratoperatedvehicle.com"
     },
     "summary": {
       "total-successful-session-count": 1,
       "total-failure-session-count": 0
     }
   }
 ]
}

Any suggestions on what I messed up? Or is this a disguised policy
error?

$ dig _mta-sts.ratoperatedvehicle.com @8.8.8.8 txt +short
"v=STSv1; id=2024030501;"

https://mta-sts.ratoperatedvehicle.com/.well-known/mta-sts.txt has:

version: STSv1
mode: testing
mx: mail.ratoperatedvehicle.com
mx: www.mwl.io
max_age: 43200

Apparently "Google will only process policies with a max_age higher than 86000 seconds. Policies with a max_age of 86000 or lower will be ignored and a daily no-policy-found report will be sent if TLS-RPT is enabled."
(link: https://www.uriports.com/blog/mta-sts-explained/)

So if you want Google to consider your policy as "valid" you shoud make max_age 86400 or higher. ¯\_(ツ)_/¯

Cheers,
Bernardo
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