Since last Thursday afternoon I've been seeing this whenever postfix sends an email to either myself as a log snip or reports spam to 'uce.gov'. AFAICT this does not affect the sending of these messages. This is Postfix 2.11.0 installed on a Ubuntu 14.04 LTS box.
Aug 30 10:09:37 localhost postfix/smtp[30967]: 9A30111C1376: to=, relay=smtp.embarqmail.com[205.219.233.11]:587, delay=576, delays=575/0.01/0.35/0.33, dsn=2.0.0, status=sent (250 SPF validation soft failure)
Aug 30 10:42:35 localhost postfix/smtp[32067]: B724611C1376: to=, relay=smtp.embarqmail.com[205.219.233.11]:587, delay=0.64, delays=0.15/0/0.2/0.29, dsn=2.0.0, status=sent (250 SPF validation soft failure)
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