Various techniques are used to prevent email spam (unsolicited bulk email). No technique is a complete solution to the spam problem, and each has trade-offs between incorrectly rejecting legitimate email (false positives) vs. not rejecting all spam (false negatives) - and the associated costs in time and effort. Anti-spam techniques can be broken into four broad categories: those that require actions by individuals, those that can be automated by email administrators, those that can be automated by email senders and those employed by researchers and law enforcement officials.

Share tech news, updates, or what's on your mind.

Sign up to Post

Emails that include a specific office number sent from GoDaddy Office 365 are being flagged by Gmail as SPAM.

When I send emails that do not include this specific office number, emails are delivered to the Gmail users Inbox.  When the body or email signature includes the extension 8305, gmail will deliver the email to the SPAM folder.  I have tried all different variations, including bracketx, dots, hyphens, spaces, etc... when you add the entire number, the email is sent to the Gmail SPAM folder.  I have even swapped out the numbers, and the email is delivered perfectly.  Its only with the 8305 extension is added to the email, that gmail decides to filter and deliver the mail to the SPAM folder.  

Also, when I test and send the exact email from my on-prem Exchange 2010 box, the email is delivered properly to the gmail Inbox.  I was leaning more towards Google being the issue, but it seems to be GoDaddy Office related.  What exactly should I be looking for? In my research, I see posts to ensure that my SPF and DKIM are setup properly.  I have checked MXtoolBox and everything comes back OK.  Not sure what else to check?  Any suggestions?
Bootstrap 4: Exploring New Features
LVL 12
Bootstrap 4: Exploring New Features

Learn how to use and navigate the new features included in Bootstrap 4, the most popular HTML, CSS, and JavaScript framework for developing responsive, mobile-first websites.


As part of a local football club, I email out newsletters through Campaigner from our club's email address to subscribers of newsletter which details news for the club.

There are 250 people who receive the newsletters and they had subscribed to the newsletters themselves.

Until recently, these newsletters were delivered successfully each week.

For the last few weeks, these newsletters have been sending to the subscribers' spam folders.

To fix this problem, we set up or DKIM and SPF records correctly for Campaigner.

This week 4 out of 250 people received the newsletters correctly.

Mostly all of the subscribers use Gmail.

If all subscribers put in the club's email address, where newsletters are sent from, into their contacts in Gmail would that solve anything?

What are your thoughts on this matter?

Can't email to Verizon, AOL or Yahoo from Godaddy account. Logged in to Godaddy webmail so its not the client. Logged in from several locations. Made new Godaddy emails on the same domain. Domain is not listed in RBL blocking anywhere. Godaddy says their mail servers are fine. CAN send to all three other ISPs from several other email addresses which are not on Godaddy.
All of our customers run Symantec Mail Security for MS Exchange (SMSMSE) 7.9 to protect their Exchange servers of various flavors.  We've noticed that in the last 6 months, the volume and sophistication of inbound virus/malware content for multiple customers has forced us to switch to Rapid Release defs; if we stay on certified, messages with malicious attachments get through, even if the certified defs are only a day (or less!) old.  That's with heuristics on maximum, and blocking of macro-enabled Office attachments, VBA content, and quarantining of multimedia files.  Is anybody else experiencing this too?  What are you doing to mitigate it?

The other issue is that RR definitions aren't as reliable as certified defs, and sometimes spontaneously (and silently) fail to load.  Once we've noticed that's happened, one of the easier fixes is remoting to the server, manually updating certified defs, then updating rapid release again.  Almost like SMSME Rapid Release gets 'stuck' sometimes, and that 'unsticks' it.  The trick is noticing it's happened in the first place, because SMSMSE itself doesn't consider defs out-of-date until several days have passed, and so won't report on them.  We can't wait several days to know--as I mentioned, certified defs of even the same day are too out of date to provide complete protection.

To that end, we set up a scheduled report with a our PDQ Inventory automation tool, that monitors the modification date on the catalog.dat file in the virus…
my domain is listed in spamhaus DBL and i send lot of request but is not resolve the problem yet ,someone can help pleaase ????
In a Nation Builder nation, I have a 700-member e-mail recipient list. The majority of these recipients were imported when my nation was set up a couple of months ago. Email to these recipients is solicited because they all pay a monthly/annual fee for membership.

I've sent about a dozen email blast in this time without problem, and I get stats on how many people opened links inside the emails, how many bounces, how many are ad addresses. However a couple of weeks ago, I sent one out and it first reported everything to be OK, with zero bounced, but after about 4 days, the bounced shot up to 117. This was highly irregular because the highest number of bounces before this was about 8. I had a look at the 117 and they are all Yahoo, AOL or Sky addresses, and since AOL and Sky go through Yahoo, we can assume that this is specifically a Yahoo problem. Here's the message that appears in Nation Builder next to each bounce...

4.0.0 Email was deferred due to the following reason(s): [IPs were throttled by recipient server]

I've done two more blasts since this, and the same thing happens. I've checked with a few owners of these email addresses and can confirm that the emails are not being received.

Is there anything I can do to help this situation, either on Nation Builder, on Google G-Suite, or on Yahoo? I've contacted Nation Builder support, but all they suggested was that I send a handful of emails at a time in order to rewarm Yahoo. But this could take a long time, …
I have a problem with some exchange servers 2010.
I have an external anti spam filter (online) to point my MX Record.

When an email come to the antispam filter. Every mail was tagged [spam] in the object email but it's the exchange server who tagg [spam] not our antispam filter.
If I disable all option's antispam in exchange manager.. I have always [spam] in object..
But if I point my MX directly to my exchange server, the mail come correctly to the mailbox without [spam].

Some people have an idea to resolve this problem.

For informations all work fine before last week.

Many thanks.
Error from web server 471 - License Invalid : unable to GET:

Symantec Brightmail Gateway v10.6.3-2

I notice the spam definition is not up to date. 17840 days ago.

how can i fix this ?
Hi all,

we facing a DUHL SORBS problem, customer moves to tele2 fiber, changed IP and DNS and suddenly 20% of the sent mails are blocked by DUHL SORBS.
We try now for 3 months to figure out what is wrong, Tele2 won't help at all.
same settings works fine for 5 years on a VDSL line, so it's very unclear why this is happens.

sbs2008 server receives mail via spamexperts spamfilter so the MX points to them. and

we have spf in place v=spf1 a
where is the tele2 mailproxy we use this at the moment to avoid mail delivery problems, but some outgoing mails still fail
where is the webshop supplier.

PTR is in place and point to the customers sbs2008 server.

When I tried to delist with SORBS is says that the whole IP block is listed and that only the ISP that owns the IP block can delist is.
When i login by SORBS i found this:

End users may submit change requests if suitable rDNS is in place.

NOTE to end users: "Suitable rDNS" means there should be a PTR record that points to a hostname that is listed in your MX record, and the MX record should refer to a hostname that resolves to the same IP address.  If it does not we CANNOT delist you!  For further information, including details on "Suitable rDNS"

any help will be preciated.

Best regards,

Victor Esselman.
i need to remove my mail server IP from spa list as attached 2018-10-14_103952.jpgpam
CompTIA Cloud+
LVL 12
CompTIA Cloud+

The CompTIA Cloud+ Basic training course will teach you about cloud concepts and models, data storage, networking, and network infrastructure.

We have multiple customers with on-prem Exchange servers interested in adding cloud antispam to their arsenal, but we’re facing a ‘tyranny of choice’ situation where we’re not sure which service to recommend, because they all look pretty good.

What’s your preferred cloud antispam/AV service, and why?  Conversely, is there a service you had bad experiences with, or otherwise avoid—if so, why?  We’ve been looking at Barracuda, Mimecast, and the Email Laundry, but we’re certainly open to other options too.

The solution needs to provide inbound & outbound antispam filtering with a quarantine feature, antivirus scanning, DKIM/SPF/DMARC support, attachment sandboxing, link following, etc.  No cloud archive is needed.  We’re a small shop, so access to a competent support team is also a must, preferably one based in the US or Europe.

Unfortunately, O365 is not an option for these customers—we have to stay onprem, so this product must support onprem Exchange.

Thanks, everyone!
We are on Office 365 . Lately, we we are getting emails from our CEO going to random people in our company on the same domain , but emails are not from him . They normally ask re recipients a response “ are you available today ? “
We know it’s not from him be use when we go in and look at the email address it’s not him . It just has his name . We do have spf records in place .
My  Outlook email is bouncing due to spam filter and it looks like it is coming from C:\Program Files (x86)\Microsoft Office\root\Office16  Any idea how to resolve this?
Hello Experts

I would like to be able to talk and get some questions about the configuration of spam in MAILENABLE.
We have a Hybrid email environment and all the user mailbox has been created over office 365 and synced with local AD.

Off late after enabling a password notification email through Local AD we have been receiving loads of spams and phishing emails with the content more often then not being a password expiry or reset password notification.

Any idea if the new password expiry email set up would cause or what could be the prime reason for such emails getting triggered.

I guess there's a relation between how spammers identify the modification and then use similar content.

how coud we tackle such issues or any indepth knowledge on how these work could be a great topic for discussion.
Scrollout F1 is setup as a SPAM inbound gateway to an Exchange server.  We have some senders whos emails won't deliver to the Exchange server.  Thus far the emails have not kicked back.  The remote Exchange server is stating the message delivery has been delayed.  I am assuming Scrollout is terminating the connection from the remote mail server.  I did notice that the remote domain doesn't have an SPF record.  Would that be enough to cause this issue?  What can I do i Scrollout to mitigate the issue so we can receive their emails?  I don't see anything in the logs of the web interface that report any activity for the remote server domain.  Are there other logs on the Scrollout file system that I should be looking at?

Any help would be appreciated
You have a secure Document from . Open message below

 click here.

Note; Your email and your password is required for authentication.

Can you please let me know how to block this message in o365 and what are the  preventive steps? Thanks.


Note- please help me how to block - we have o365
I want to know about email spoof.
For example , I know that we can verify an email is spoofed or not by SPF.
But using ,we can know it is spoofed mail, but it goes into inbox.
Why it is not filter by spam-filter?
Thank you.
Phishing scam: "Pending message"- how to set my sonic wall for such type of email. We have O365 email system. Thanks
Exploring ASP.NET Core: Fundamentals
LVL 12
Exploring ASP.NET Core: Fundamentals

Learn to build web apps and services, IoT apps, and mobile backends by covering the fundamentals of ASP.NET Core and  exploring the core foundations for app libraries.

email that I'm sending is now going to my customers spam boxes.  kinda happened out of the blue.  its not bulk emails.  its individual emails the i type with info for my clients.  i do copy/paste some info that goes into each email as well.

been working fine for years...its just all of the sudden everyone is saying that email is going to their junk boxes.  

its my own private domain email, i use gmail as the client for checking and sending it.

i havent changed anything on my end.  what do I need to look for to see what is going on?  TIA
How to block outgoing SMTP-connections from one IP on a Linux server.

I have a Linux server (Running Plesk) with 2 IP's
IP1 is used for website
IP2 is used for mail

I want to block users from creating script to send mail directly (spam).
All mail are supposed to be send via the mailserver on IP2

In the Plesk Firewall, I can block incoming connections on ex. port 25, but not (as far as I can see) outgoing.

I found this suggestion:
iptables -I OUTPUT -m owner ! --uid-owner postfix -m tcp -p tcp --dport 25 -j REJECT

How can this be done?

ISP LTD magticom, from our server cant sending email to domain, reason :
host []
    SMTP error from remote mail server after end of data:
    550 Mail content denied.
please unblock our server's ip.
thx for cooperation
Hi There,

For the past few weeks users on my network and users they typically email have been complaining about receiving a lot of spam from our users.  I have gone around to every computer and ran malware cleaning tools such as malwarebytes, superantispyware, ccleaner, adwcleaner, antivirus and so on.  I have found many problems and removed them but the spam will stop for a few days then suddenly come back with a ton of emails.  Our email is hosted by an outside company like godaddy and it is pop.  We don't have a good firewall yet so i can't scan the logs of the firewall.  Is there another way to scan the network to detect which pc has the spambot infection and do you know how to remove the virus.
Hello ,

I imagine that if there is a transparent anti spam server works like in a topology as this :

------------->   SERVER BOX ---------------->  Switch ----------------> Hosting / Mail ...etc. servers.

I want to know if there is a software that works without creating config for each domain / mailbox will handle the mails and send to the servers if they are not spam
Hi All,

Could I ask for your recommendations please. I am having lots of problems with loads of spam at the moment on my server.  I used to run AVG on the server but still my clients had far too much spam getting through.  Can you suggest what is best.  I only have a small network of 10 clients and 1 server and limited budget.  Have been attempting to get BitDefender but their customer service is poor at the moment as I have been awaiting a call back for 2 weeks after several chase ups.

Have tried using the spam setting within my Windows setup but changing the setting makes little difference.

Many thanks


Various techniques are used to prevent email spam (unsolicited bulk email). No technique is a complete solution to the spam problem, and each has trade-offs between incorrectly rejecting legitimate email (false positives) vs. not rejecting all spam (false negatives) - and the associated costs in time and effort. Anti-spam techniques can be broken into four broad categories: those that require actions by individuals, those that can be automated by email administrators, those that can be automated by email senders and those employed by researchers and law enforcement officials.