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I read the post "How to send e-mail from your website (PHP mail)" but it's impossible to use any mailserver because I cannot se TXT or DKIM record which are mandatory for the mailservers.
I also tried with mailgun, sendgrid, mailjet, pepipost, sparkpost and sendinblue and all of them require TXT or DKIM.
Do you have any other idea on how to configure the custom email address to work outside the Webmail?
Thank you in advance!!