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I was using mailgun with “WP Mail SMTP” plugin and all my emails was delivering after 4, 5 minutes later.
contacted mailgun support , and they showed me that the mails delivered to mailgun after 5 minutes wordpress send the email , so it was not their problem.
now I changed my mail sending plugin and the problem is disappeared, I am wondering why we have so much delay while we are using “WP Mail SMTP”