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> The log on the client side is:
> Jun 20 14:51:20 nagios postfix/qmgr: 260C863CE8:
> from=<root@...>, size=343, nrcpt=1 (queue active)
> Jun 20 14:51:22 nagios postfix/smtp: 260C863CE8:
> to=<nicolas@...>, relay=domain.es[X.X.X.X]:25, delay=2.7,
> delays=0.03/0/2.7/0, dsn=4.0.0, status=deferred (SASL authentication
> failed; server domain.es[X.X.X.X] said: 535 Incorrect authentication
> Surprisingly on the server side (mail.domain.es) there's no log activity.
Are you really sure your email is directed to the correct server? Is
the A record for domain.es the same as for mail.domain.es?