What does postconf smtpd_policy_service_timeout return on your servers?
That defaults to 100s and according to your logs, it's returning sooner
than that. A totally braindead DNS server can suck up up to 80s (20s
SPF HELO lookup + 20s TXT HELO lookup + 20s Mail From SPF lookup + 20s
Mail From TXT lookup).
** Changed in: postfix-policyd-spf-perl (Ubuntu)
Status: Triaged => Incomplete
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SPF rejects mail on unsupported SPF RR type
https://bugs.launchpad.net/bugs/161133
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Bugs, which is the bug contact for Ubuntu.
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