Resolved SPF record not working

phungkha

New Pleskian
Hello there,
I am sending SMTP mail from subdomain.com and mail is successfully sent to the recipent. but Gmail recipient still shows it as "Gmail couldn't verify that subdomain.com actually sent this message(and not spammer)" though I had an SPF record add "v=spf1 +a +mx +a:focused-kepler.xx-xx-xx-xx.plesk.page -all" Please help me find out the problem,
 
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