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451 4.4.0 SMTPSEND SuspiciousRemoteServerError; remote server disconnected abruptly; retry will be delayed};[FQDN=...};{ip=....}]

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When sending email with attachments more than 5MB the delivery to the recipient is delayed for more than 10 hours. I am sending a test email to gmail account. 

Receiving emails also are delayed for 6-8 hours, specially with attachments of 6mb. 

Pls. help. 


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