I've used AuthSMTP for years to send all of my email to avoid black list
problems.
On 10/01/2016 11:01 AM, Josh via Lazarus wrote:
Hi
Sounds like backscatter mail;
Sender is spoofing your email; as long as you have valid spf, and dkim
for the sending domain the spoofed email should be picked up by most
well configured mail server as not originating from sender and not
deliver; sometimes the mail server may send a message back to your
server informing you that an email was received that failed spf and dkim
and was not delivered.
An analogy would be somebody sending a letter to an unknown person and
placing your home address as the sender on the envelope; the person it
was sent to opens it; and send back 'return to sender'; you then get the
letter as your home address is on the letter,having not sent it in the
first place, very annoying.
Sometimes an email or domain can be attacked in this way to send out
spam/viruses etc, and by having valid spf/dkim etc should reduce the
possibility of this happening; however one thing that you will need to
check regularly is that you do not get black listed use something like
mxtoolbox to check your domain is not black listed; as if your getting
attacked in this way and spam/viruses are 'appearing' to come from your
domain; mail servers can be configured to auto report this activity to
the likes of protected sky etc causing a blacklisting; once your
blacklisted you will have problems sending to the likes of
hotmail,gmail,aol,yahoo etc as well as company mail servers that use
these blacklisting services as blacklist filters.
if you getting problems sending to gmail/yahoo/hotmail,outlook, live
etc. Make sure that you have signed up to the bulk mail sending service
( or something like that; it is specific to each one so may take some
googling) so that they do not block you dead; hotmail,outlook,live etc
if you get black listed can take some time to get cleared as it is not
automated and is done by human and you will have to jump through some
hoops to clear it.
I come across this a lot; it seems to have escalated in the last 6
months. I have one mail server that is only confirming less than 0.2% as
valid emails a months; the rest 99.8% is backscatter/spoofed emails;
that you have no control over as you have not sent them. On this one
server it was getting blacklisted twice a week; I even took the server
down for a 2 week period; and it was getting blacklisted during this
period.
Just food for thought.
Might be of use.
-----Original Message----- From: Sascha Hestermann via Lazarus
Sent: Saturday, October 01, 2016 4:02 PM
To: Lazarus mailing list
Cc: Sascha Hestermann
Subject: Re: [Lazarus] that's surprised me a lot
Am 01.10.2016 um 13:48 schrieb Shaun via Lazarus:
sorry to inform you but the link leads to a scam site that has been
doing the rounds for quite some time.
That's indeed a spam mail and it wasn't sent by me. As far as I can tell
they faked the sender and used my name and mail address.
Looking as the source code of the mail reveals it was sent by
109241132252.raciborz.vectranet.pl via mailhost.mobimail.mobitelnet.lk,
so no Gmx was involved.
Since a few month I have seen several of such mails and also get
"Undelivered Mail Returned to Sender" mail from time to time for mails I
did not sent.
I don't think I can do anything about that as the mails are neither send
by me nor by my computer.
--
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