Hello,
We at contactlab are considering a change in the deactivation of hard bounces.
Currently, we suppress not existing mailboxes at the first hit.
We are aware of a small percentage of false positives.
Recent admissions criteria for Certified Senders states:
"The CSA sender must take emai
If you keep the retry far enough apart, the second hit could be okay,
but you will run into cases of 'over quota' and temporary failures.
Technically, hard bounces take very little overhead on the receiving
side, since the check is at SMTP layer, so unless you have a wide spread
problem, eg a
On 27 Feb 2019, at 11:16, Marco Franceschetti via mailop wrote:
Hello,
We at contactlab are considering a change in the deactivation of hard
bounces.
Currently, we suppress not existing mailboxes at the first hit.
We are aware of a small percentage of false positives.
Recent admissions crit
On 2019-02-27 9:27 a.m., Bill Cole wrote:
However, there are specific basic and enhanced SMTP reply codes which
are direct explicit statements that an address is non-existent which
should be honored immediately rather than taken as possibly mistaken and
retested later with a different message.
We've just received what I'm 99% sure is a phishing email - sent through
the Mandrill/Mailchimp infrastructure, claiming there's a problem with
our Mailchimp account. The links go to landing pages on MailChimp, and
it's clever.
So, it needs sorting, ASAP, because it's quite likely to catch peo
Hi Marco,
Do you have a way to approach this scientifically with a well-structured
experiment of your own? The data will tell the story for ContactLab’s unique
mix of customers and receivers.
Some sophisticated receivers are known to downgrade the reputation of senders
who repeatedly attempt
Paul, please pass the info to us offlist and we'll get it in front of the right
person ASAP.
Anne
*Typed with 1.5 eyes as I'm recuperating from a torn retina, so apologies for
any typos.
> On Feb 27, 2019, at 10:47 AM, Paul Smith wrote:
>
> We've just received what I'm 99% sure is a phishing
On 27 Feb 2019, at 12:36, Michael Peddemors wrote:
On 2019-02-27 9:27 a.m., Bill Cole wrote:
However, there are specific basic and enhanced SMTP reply codes which
are direct explicit statements that an address is non-existent which
should be honored immediately rather than taken as possibly mi
If you ignore hard bounces on the Hotmail infrastructure...'
There will come a day, possibly sooner than you'd like, when the system will
blacklist you, and you'll find it hard to get mitigated.
All automatic.
Aloha,
Michael.
--
Michael J Wise
Microsoft Corporation| Spam Analysis
"Your Spam Sp
They say you could do this and the max is 3, they do not they you have to wait
until the third one. That’s a big difference!
Kind regards,
/ Tobias Herkula
Manager Detection Anti Spam
Cyren (Berlin)
Von: mailop im Auftrag von Marco Franceschetti via
mailop
Ge
On 27 Feb 2019, at 13:34, Michael Wise via mailop wrote:
If you ignore hard bounces on the Hotmail infrastructure...'
There will come a day, possibly sooner than you'd like, when the
system will blacklist you, and you'll find it hard to get mitigated.
All automatic.
I sincerely hope that th
Some of us have to clean up the stick.
Messy work.
Aloha,
Michael.
--
Michael J Wise
Microsoft Corporation| Spam Analysis
"Your Spam Specimen Has Been Processed."
Got the Junk Mail Reporting Tool ?
-Original Message-
From: mailop On Behalf Of Bill Cole
Sent: Wednesday, February 27, 201
I realized I sent this to Paul, but forgot to CC the list. So I’m sending this
again.
Hi Paul (et al),
Thank you for mentioning this. In the interest of being transparent, and
because the folks here are more savvy to these types of issues, our anti-abuse
team has been tracking a group of malic
Hi Marco,
I am curious what false positives you encountered.
We suggest to classify bounces using multiple features, the text, the
enhanced status code, and the status code. If the bounce is clearly an
invalid address, then remove it after the first bounce. For example when
the text contains “mai
> I realized I sent this to Paul, but forgot to CC the list. So Iâm
> sending this again.
>
*snip*
> Unfortunately, some mail is still able to slip through the net. We are
> also unable to identify these compromised accounts before the malicious
> mail is sent, because the Mandrill account cred
Hi Mark,
My main intent with my response was simply to let y’all know that we are aware
of and acting on the phishing. But, I’ll take a moment to address your response
as well since you took the time to offer some tips.
We offer many or most of (or at least similar) features to what you’ve
men
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