As of this morning I can't reproduce the issue. MTA-STS is enabled and test messages are going through to Google. I see the TLS connection in the SMTPOutbound log. Yesterday in my testing I saw five different Google IPs and a sixth this morning. I'm not sure what conclusion to draw from this. It's working so I guess that's a win.
Just for fun here is results of DNS lookup this morning.
| DNS Server used: |
dns://108.61.10.10 dns://[2001:19f0:300:1704::6] |
| A |
172.217.15.197 |
| MX |
20 alt2.gmail-smtp-in.l.google.com.
209.85.202.27
30 alt3.gmail-smtp-in.l.google.com.
64.233.184.26
10 alt1.gmail-smtp-in.l.google.com.
64.233.186.26
5 gmail-smtp-in.l.google.com.
173.194.212.26
40 alt4.gmail-smtp-in.l.google.com.
142.250.27.26 |
| TXT: |
globalsign-smime-dv=CDYX+XFHUw2wml6/Gb8+59BsH31KzUr6c1l2BPvqKX8=
v=spf1 redirect=_spf.google.com |
