Random: Business Email DoS - Commercial Email Filters now automatically flag messages sent using a different server.

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Feb 10, 2021, 9:46:12 PMFeb 10
to 2600-australia
Stupidity Advisory:

This one is a little one -
A number of commercial email filters, including google now
by default too;  prohibit and flag all email not sent from
the same IP as the sender MX domain. Google in particular
specifically call these "illegal emails" now and actively
discriminate against this sort of email.

Obvisouly this was always an option in the past, but now it
is no longer optional.

Why is this a problem?
Many small organisations use shared hosting or off site
domain and email hosts.     For a variety of reasons due to
standard security configurations, or simply to speed up
outbound email transmission times these organisations cannot
use their email provider for outbound mail  - their ISP may
block it as standard (as is the case in the entirety of xtra
NZ) or the organisation may have multiple mailboxes or
domains, and their mail client (example thunderbird)
defaults to a single outgoing server; which would reject
relay on all messages but the mailbox matching its security
credentials.

As a result many organisations utilize their ISP's outbound
server, a situation that most ISP's happily cater for - or
install their own in-house local relay server .  In the past
this has worked well for many.  Attachments in particular
will upload faster to a local outbound mail server this way.

This however has resulted in an accidental "DoS" situation
where many of these organisations can now no longer conduct
business with email - all messages sent in this scenario
will immediately be classified as junk/trash and never seen
by the recipient if they use any of the google or similar
commercial mail filters.

With the possible exception of those using their ISP's
internal email address (something which is a stupid idea
given how many online services use email as a form of
identity confirmation, and anyone changing ISP's will
immediately lose their mailbox)   this means a large part,
and possibly the entirely of NZ business's will now no
longer be able to contact a large percentage of the world
using email anymore, and small organisations will likewise
need to telephone or otherwise notify associates to check
their spam folder any time they send an email.  Clearly an
absurd situation for google and the similar commercial
filtering services to have caused.

Peace.

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