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[Solved] Undelivered Mail Returned to Sender - SPF for GMAIL


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Hello Sir,
Sorry, could you help me to fix this error please ?
When, i try to send email on *gmail address, i have the error:

This is the mail system at host tommy2.heliohost.org.

I'm sorry to have to inform you that your message could not
be delivered to one or more recipients. It's attached below.

For further assistance, please send mail to postmaster.

If you do so, please include this problem report. You can
delete your own text from the attached returned message.

                   The mail system

<********@gmail.com>: host gmail-smtp-in.l.google.com[]
    said: 550-5.7.26 This mail is unauthenticated, which poses a security risk
    to the 550-5.7.26 sender and Gmail users, and has been blocked. The sender
    must 550-5.7.26 authenticate with at least one of SPF or DKIM. For this
    message, 550-5.7.26 DKIM checks did not pass and SPF check for
    [dagounlock.tk] did not 550-5.7.26 pass with ip: []. The sender
    should visit 550-5.7.26
    https://support.google.com/mail/answer/81126#authentication for 550 5.7.26
    instructions on setting up authentication.

I check this link and add on my Cloudflare's dns: TXT     dagounlock.tk      v=spf1 include:_spf.google.com ~all   
but still have the error.

(when I try to send an email on the online temporary email address service, it was received correctly)

Thank you very much.

username: mgunlock
site: dagounlock.tk

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