How can I force mails sended by Mailer (Symfony4) to be receive in inbox and not in spam?

I would like to be sure that my emails sent manually via Symfony 4 Mailer are received in the inbox of my recipients’ mailboxes and not in spams. Is there a way to go about forcing this?

FYI, my emails are sent from an IONOS email account.

Thank you in advance,



Source: Symfony Questions

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