Verifying the email delivery completion

[Francisco Neira]

Hi all,
I had been successfuly using check_smtp to verify the SMTP service.
Few days ago, one of our SMTP servers was still listening on 25 but messages
where all rejected with a 451 error. (451 mail server temporarily rejected
message (#4.3.0))
Is there any way to verify the email delivery completion?

Thanks in advance for your help.
Regards,


-- 
Francisco Neira, ISO 27002
Usuario Linux # 165985
ISACA No.565432, IEEE No.90934498
Lima, Peru -05:00 GMT9
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