Undeliverable mail: Ïpeäëaãaeòcÿ k npoäaæe y÷acòok çemëè â Aëòaéckom kpae. N2

[MAILER-DAEMON at mx.exler.ru]

Failed to deliver to 'portal-bot at 21.ru'
SMTP module(domain mx0.kurepin.ru) reports:
 host mx0.kurepin.ru says:
 550 portal-bot at 21.ru unknown user account

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