[ic] Undeliverable mail: Mail Delivery (failure 20info@juresta.nl)

[MAILER-DAEMON at etrn.is.nl]

Failed to deliver to '20info at juresta.nl'
SMTP module(domain juresta.nl) reports:
 host mx.is.nl says:
 550 5.1.1 <20info at juresta.nl> is not a valid mailbox

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