Hi,
I am using postfix to send e-mail. My home machine is called
xxx.sub.example.com (I am user with rm11) and my work email address is
r...@example.com. My ISP at home is not through my employer but I use VPN
through that. I use localhost as my smtp server and my e-mail address
as the sendmail address. This has worked fine but today I got the following
error/failure with two different recipient e-mail addresses. Here
are the error messages (similar for both):
This is the mail system at host xxx.sub.example.com.
I'm sorry to have to inform you that your message could not
be delivered to one or more recipients. It's attached below.
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 attached returned message.
The mail system
<x...@xxxx.xxx>: host mx.smtp.xxxx.xxx[ip] said: 554 5.7.1 R:DNS
- Message sourced from 70-81-125-2.client.isp.com [70.81.125.2] not
allowed. For assistance e-mail <h...@it.xxxx.xxx>. (in reply to RCPT TO
command)
Reporting-MTA: dns; xxx.sub.example.com
X-Postfix-Queue-ID: AB5C921088
X-Postfix-Sender: rfc822; r...@example.com
Arrival-Date: Wed, 1 Jul 2020 17:34:21 -0500 (CDT)
Final-Recipient: rfc822; recipi...@xxxx.xxx
Original-Recipient: rfc822; recipi...@xxxx.xxx
Action: failed
Status: 5.7.1
Remote-MTA: dns; mx.smtp.xxxx.xxx
Diagnostic-Code: smtp; 554 5.7.1 R:DNS - Message sourced from
70-81-125-2.client.isp.com [70.81.125.2] not allowed. For assistance:
e-mail <h...@it.xxxx.xxx>.
Looking at the recipient webpage for the information (actually, quite helpfully
provided), I get:
Your IP address appears on the SMTP gateway blacklist. This means that you will
not be able to send email messages directly from your computer
system to any address here that passes through the SMTP gateway. You will need
to use your ISP's mail servers to relay your email
messages. Please consult your ISP if you need assistance.
If you are attempting to send mail from a static IP address or you otherwise
believe that your address should not be blocked, please contact
our helpdesk via telephone at or via email.
I am not sure what to do here, but would appreciate any advice. What I do not
understand also is if I use VPN, why does it go through the
ISP server which is blacklisted?
Happy to provide needed information.
Many thanks and best wishes,
Ranjan
