下面兩個對方拒絕收信的訊息，是什麼意思?有何不同?
(1) This is the Postfix program at host mail3out.giga.net.tw.
I'm sorry to have to inform you that the message returned
below could not be delivered to one or more destinations.
For further assistance, please send mail to <postmaster>
If you do so, please include this problem report. You can
delete your own text from the message returned below.
The Postfix program
<ruby@msa.hinet.net>: connect to msa-mx3.hinet.net[168.95.5.114]:Connection refused
(2) This is the Postfix program at host mail1out.giga.net.tw.
I'm sorry to have to inform you that the message returned
below could not be delivered to one or more destinations.
For further assistance, please send mail to <postmaster>
If you do so, please include this problem report. You can
delete your own text from the message returned below.
The Postfix program
<ruby.a0211@msa.hinet.net>: connect to msa-mx7.hinet.net[168.95.5.142]: server refused mail service