Problem sending mail from Ibm i

Hi all

I have a program that sends invoices as attached to mails ; every invoice
is sent to the customer and also to our mail box info@xxxxxxx. This morning
I run this program and after about 300 invoices sent, the mail to our mail
box info@xxxxxxx are not more delivered but that to customer yes. Reading
the log in the journal for the mail addressed to out info@xxxxxxx I see:



21DFABV1607061031260000000595 9T MSG SIZE 83336
2016-07-06-10.31.26.540000

21DFABV1607061031260000000595 95 RIN TO SRVR ::ffff:192.168.1.90
2016-07-06-10.31.26.540112

21DFABV1607061031260000000595 91 O automatic_mail§xxx.com
2016-07-06-10.31.26.540128

21DFABV1607061031260000000595 92 R <info§xxx.com>
2016-07-06-10.31.26.540128

21DFABV1607061031260000000595 96 SRVR TO QTMSOUTQ
2016-07-06-10.31.26.542560

21DFABV1607061031260000000595 8B QTMSOUTQ TO CLNT
2016-07-06-10.31.26.544512

21DFABV1607061031260000000595 8C CLNT TO QTMSRTQ1
2016-07-06-10.31.26.738288

21DFABV1607061031260000000595 8E QTMSRTQ1 TO QTMSOUTQ
2016-07-06-11.02.08.748672

21DFABV1607061031260000000595 8B QTMSOUTQ TO CLNT
2016-07-06-11.02.08.750528

21DFABV1607061031260000000595 8C CLNT TO QTMSRTQ1
2016-07-06-11.02.08.903616

21DFABV1607061031260000000595 8E QTMSRTQ1 TO QTMSOUTQ
2016-07-06-11.32.59.044416

21DFABV1607061031260000000595 8B QTMSOUTQ TO CLNT
2016-07-06-11.32.59.046672

21DFABV1607061031260000000595 8C CLNT TO QTMSRTQ1
2016-07-06-11.32.59.181264

21DFABV1607061031260000000595 8E QTMSRTQ1 TO QTMSOUTQ
2016-07-06-12.03.25.169040

21DFABV1607061031260000000595 8B QTMSOUTQ TO CLNT
2016-07-06-12.03.25.170768



It seems that I tried to send mail at 10:31 then at 11:02 , then at 11:32
and at the end at 12:03 , the problem was due to the Mail Server ? o other

Thanks in advance for any suggestion