Undeliverable mail: óòðà þíîì ñâåòå

[MAILER-DAEMON at gate-0-1.scana.net.ua]

Failed to deliver to 'jerry at scana.com.ua'
SMTP module(domain scana.com.ua:25) reports:
 host scana.com.ua:25 says:
 550 jerry at scana.com.ua unknown user account

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