Siang ini saya menemukan ada client colocation yang tidak bisa kirim email ke email tujuan dengan error 554-us3.mx.mailhostbox.com ESMTP not accepting connections.
Untuk lengkap problem Log / Bounce back nya seperti berikut :
This message was created automatically by mail delivery software.
A message that you sent could not be delivered to one or more of its
recipients. This is a permanent error. The following address(es) failed:
george@xxx.com
host us3.mx1.mailhostbox.com [199.79.63.224]
SMTP error from remote mail server after initial connection:
554-us3.mx.mailhostbox.com ESMTP not accepting connections
554 Please see http://support.mailhostbox.com/email-administrators-guide-error-codes/ for explanation of the problem.
Dan Jika di lihat dari log exim server nya seperti berikut :
2020-10-07 10:48:38 1kQ0RJ-0001eo-JP ** adm.jkt@xxx.com <Adm.jkt@xxx.com> R=dkim_lookuphost T=dkim_remote_smtp H=us3.mx2.mailhostbox.com [199.79.63.226]: SMTP error from remote mail server after MAIL FROM:<ariyani@xxx.id>: 550-5.7.1 Command rejected\n550 5.7.1 Please see http://support.mailhostbox.com/email-administrators-guide-error-codes/ for explanation of the problem.
Dari log di atas dapat disimpulkan kemungkinan IP mail out / IP smtp domain nya di blok oleh server tujuan .
