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[public-dns-discuss] Intermittant DF Only from Gmail/G Suite



I'm the public DNS admin at TGH. Last Friday we started having trouble with some users at tgh.org being unable to receive mail from Gmail and G Suite users.
It appears that our MX record is resolving fine. I'm unsure where to look for more info on this. As a band-aid I increased the TTL on the MX records to 12H
in hopes that the entry would at least cache longer. This has resolved issues for most, but not all users. Some message are delayed several hours.

{ "Status": 0, "TC": false, "RD": true, "RA": true, "AD": false, "CD": true, "Question": [ { "name": "tgh.org.", "type": 15 } ], "Answer": [ { "name": "tgh.org.", "type": 15, "TTL": 12405, "data": "10 mxa-00009101.gslb.pphosted.com." }, { "name": "tgh.org.", "type": 15, "TTL": 12405, "data": "10 mxb-00009101.gslb.pphosted.com." } ] }

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