The refusal by an
ISP
to accept a bounce message (one with an empty envelope sender) is increasingly rare these days, but occasionally we do see it.
This is always a bad idea:
H=mx01.csx1.net [38.103.192.105] … SMTP error from remote mail server after pipelined DATA: 550 Empty envelope senders not allowed
The sender of the message (their client remember) will never
find out that the email has not been delivered. In this case the mail was being forwarded, so it's impossible for us to do any better than accept the mail and then test the
recipient address by trying a delivery. We had to delete the bounce message — there was nowhere to send it.
E‐mail from dynamic IP addresses has long been refused by the wise postmaster, including ourselves.
The reason is that both whitelisting & blacklisting are ineffective in this case —
two tools that are essential for the world's mail administrators.
Remember also that cloud services use dynamically allocated
IP
addresses in many cases and are thus also unsuitable for relaying mail for
the same reasons given above. Currently we do not block such computing services from sending mail to our servers;
they are regarded with additional suspicion by our filters however.
The server known as
n6.tvscience.co.uk
is currently down due to a power outage in the datacentre.
Most file compression formats are ripe for exploitation these days. We've seen our first
.arj
files today:
Thank you for using our services!
Your order #37311131537 will be shipped on 05-09-2014.
Date: September 02, 2014. 03:09pm
Price: £191.50
Payment method: Wire transfer
Transaction number: 0466142997148E
Please find the detailed information on your purchase in the attached file (sale_2014-09-02_14-20-08_37311131537.arj)
Best regards,
Sales Department
Evelina Example
+07775 xxx xxx
As
PayPal
give your name and e-mail address away to its merchants
(i.e: they effectively make it public) -
we recommend our clients to use a throw-away or time-limited address for paypal accounts.
The spam will be sent to your address using your full name so:
To: "Anthony Other" <another@example.com>
Currently the spam is promoting a fake goods site with the connivance of an
ISP
based in Hong Kong.