En la seción DKIM, precionar el boton Generate Local DKIM Key
Advertencia:
A DKIM key for “mail.aldo.net.ar” does not exist on the local server.
Una vez que se generan las claves aplicar las claves.
Con esto ya debería estar solucionado.
host gmail-smtp-in.l.google.com [x.x.x.x]
SMTP error from remote mail server after end of data:
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 [deocar.com.ar] did not
550-5.7.26 pass with ip: [x.x.x.x]. 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. qz11-20004021qkn.362 - gsmtp