All Questions
76
questions
0
votes
1
answer
104
views
Weird email spam issue. Google Domain Exchange email server
We have a client who is blocking our email domain.
Their IT wrote this to us. I've never seen this be an issue before.
You are hosted on Google but have entries referring to Microsoft email protection ...
- 101
0
votes
2
answers
104
views
Check incoming email adresses on exchange server
We are using Exchange Server with Outlook, and a CMS system to manage our customer's Email addresses. The CMS can export the email address list and we could import it somewhere to outlook/exchange, if ...
- 1
0
votes
1
answer
865
views
Publishing Exchange Server public IP address in a hybrid Exchange setup?
I'm currently using the Hybrid Exchange Online and Exchange Server OnPremise setup.
I have included the IP addresses of all my Exchange Servers in the below TXT record, I wonder if it is really ...
- 1,305
0
votes
3
answers
291
views
Tag External Emails from NEW external addresses
We work with a giant company that prepends an email tag to every externally originating (to them) email that goes something like:
"Warning, this email originated outside your organization - don't ...
- 113
1
vote
0
answers
5k
views
Mail loop between spam filter and 365
I was wondering if anyone has seen this before. We have our own spam filter cluster that emails go through before being sent on to 365. When emailing from our company domain (365 hosted) to another ...
- 11
0
votes
2
answers
237
views
Suspicious Exchange message queues filling up disk space
So i came across my HD space getting full too quickly and after doing some inspecting with wireshark and powershell. It seems my email server is being used as a relay for spam.
I closed port 25 on my ...
- 197
0
votes
1
answer
913
views
Exchange Online - List-Unsubscribe
I am trying to achieve having List-Unsubscribe header functionality for our marketing emails that are being sent using Distribution list. 3rd party mailing is a no-go.
I have opened a case with M365 ...
- 113
6
votes
1
answer
2k
views
Yahoo blocked emails after changing mail server public IP address
We have two exchange edge server and we want to change their public IP addresses. Changing one of the server IP addresses (and related DNS records) was done successfully and emails are delivered to ...
- 251
1
vote
1
answer
2k
views
How to stop Backscatter (NDR) from spoofed Mail address?
some one is sending mails from a spoofed mail account from our domain ([email protected]) to hundreds, sometimes thousands of non existant russian E-Mail addresses.
The web hosts send out NDRs ...
- 31
1
vote
0
answers
72
views
Postfix - External incoming mails with company domain
We use postfix as internal and external relay and Exchange inside the organization. Our company is receiving a lot of SPAM and phising mails whose Sender is our own company domain.
Searching Exchange ...
- 11
0
votes
1
answer
53
views
why two spam policy apply on the same email
Recently, we made some Spam setting as below shown, but don't know why the result is, emails are prepended with 'spam' and move to junk mailbox at the same time. We want SCL 5 emails is prepended with ...
- 71
2
votes
0
answers
1k
views
Rejecting emails with mismatched Header/Envelop FROM
We've been receiving some spam/phishing emails that are managing to get through on occasion and the majority have a MAIL fROM our domain but their ENVELOPE from is whatever spammy address.
My ...
- 355
0
votes
2
answers
94
views
Unwanted emails are sent from some exchange users
In our exchange environment some unwanted emails are sent from a few users to abnormal addresses with .xyz suffix.They stuck in queue as the destination server isn't available.
Affected users got ...
- 251
0
votes
0
answers
2k
views
WIreshark Filter to track Exchange Traffic from PC to Exchange Server 2007 and out
I've got a Windows Exchange Server 2007 that appears to be sending mail when I've confirmed nobody is on the network. I'm trying to determine if the exchange server is compromised or if a client on ...
- 143
1
vote
1
answer
6k
views
Exchange office 365 transport rules to block spam when FROM doesn't match smtp.mailfrom or return path
I'm sure this type of question has been answered already so I apologize in advance, but I can't seem to find anything. I have spf, dkim, dmarc all setup so I'm not worried about outgoing spam, but I ...
- 11
0
votes
1
answer
2k
views
Exchange 2016 mails goes to spam folder on outlook
We have a fresh installation Exchange Server 2016. The issue is when I send emails to outlook it goes to junk folder only for outlook, for other email service providers it properly reach inbox. I ...
- 111
-2
votes
2
answers
1k
views
Exchange 2013 server blacklisted by Spamhaus PBL
The static IP address my MTA (running Exchange 2013) is running on has been blacklisted by SPAMHAUS PBL.
This IP address range has been identified by Spamhaus as not meeting our policy for IP ...
- 350
1
vote
0
answers
34
views
Exchange rule to trigger on "From" addesses of format "email <email>"
We are receiving large email flow with an interesting pattern of "From" address. They forge body "From" address as "spoofed local email ". Example: From: [email protected] <[email protected]&...
- 824
1
vote
1
answer
539
views
How do I apply DNSBLs on MS Exchange 2010?
We are lately receiving more spam. I was told we should use DNSBLs in order to reduce number of spam mails effectively.
All I was able to find out was to add IP Block List Providers manually. This is ...
- 87
0
votes
1
answer
79
views
Some Users receiving more junk spam mail
To start: we are using exchange 2010 with spam assassin.
Some of our users are experiencing a rise in junk spam emails for about two weeks now. Most of these junk emails even get to the normal inbox ...
- 87
0
votes
1
answer
693
views
phpmailer/exim4 to outlook.com mail arrive to junk directory
I would like to send a simple, email address change confirmation email with php and exim4.
I tested my mail with lot of free email provider and everywhere arrived my email well except outlook.com.
In ...
- 11
2
votes
0
answers
443
views
Anti-spam filtering in Exchange 2016 almost doesn't work
I have fresh installation Exchange 2016. I know that content filtering is depreciated since November 2016, and in some future we'll have to use EOP.
So far I've read, content filtering in Exchange ...
- 237
0
votes
2
answers
102
views
Spam getting through despite being listed on an RBL?
Our spam filter (Vamsoft ORF) is configured to look at zen.spamhaus.org among a few others. This morning, I had a mailbox full of spam. As part of my normal procedure, I opened the email, read the ...
- 348
1
vote
0
answers
1k
views
Why/how is our mail being intercepted and altered?
Today our customer replied to a mail supposedly sent by one of our employees requesting a wire transfer to a spanish bank account.
Our employee did not send this mail, nor can I find it anywhere in ...
- 111
1
vote
0
answers
1k
views
Outgoing Messages w/ Empty Sender
I am seeing what strikes me as a strange trend in outgoing mail in my organization.
On our Barracuda spam firewall, I noticed in the Top Spam Senders report that our internal Exchange server is by ...
- 141
0
votes
1
answer
4k
views
Exchange server 2016 Content Filtering
I have setup an exchange server on premise with at SMTP Relay on our VPS. It works very well, unfortunately I’m a little confused as to where I setup the various permissions for SPAM.
All my incoming ...
- 38
0
votes
1
answer
187
views
Exchange 2007 - Sending spam from MY domain but invalid, random users
I'm running Server 2003. Exchange 2007.
I've got something on the system sending out tons of spam, and now mostly blocked from the outside world. (We can receive, but not send because we're on ...
- 111
0
votes
1
answer
685
views
How to Stop Exchange Server 2003 sending out Mass Spam / Virus Email from Unkown Account?
I'm young and new to the scene, I have been working on a family member's business server. It is an old server and has a few problems but has
a big main one I'm trying to fix now.
I'll try be as clean ...
13
votes
3
answers
50k
views
All External Mail to Office 365 Fails SPF, Marked as Junk by EOP in a Hybrid Deployment
In short: legitimate emails are landing in Junk folders as EOP (Exchange Online Protection) stamps email messages as junk (SCL5) and SPF-failed. This happens with all external domains (e.g. gmail.com/...
- 318
0
votes
1
answer
529
views
Exchange 2010 - how to hide first hop IP from mail headers
My company has an Exchange server which forward outgoing emails to a mailhub, which has a spam filter.
(user)----(company's Exchange)----(mailhub with antispam)----(the world)
It happens that my ...
- 189
1
vote
0
answers
161
views
New Exchanger Server installation - Email marked as spam on hotmail/outlook
New to the email hosting scene - running an Exchange 2013 box.
Email is always (literally, always) marked as spam when sending out to my outlook.com account. Whereas if its sent to an email address ...
3
votes
1
answer
2k
views
Exchange 2013 IPBlockListProvider blocking some (but not all) matched IPs
I have configured our Exchange 2013 Edge Transport server to utilize several IPBlockListProviders including Spamhaus. While they work great most of the time, there are still some emails which despite ...
- 31
1
vote
1
answer
317
views
relearn bayes autolearned spam when mails already processed by exchange
I'm using postfix with amavis and spamassassin to filter out spam before relaying everything to an exchange server. Regularly I got mails which weren't catched by spamassassin, even worse, they were ...
- 13
2
votes
0
answers
2k
views
Exchange 2013: content filtering bypass
I have just completed a migration from a single Exchange 2007 to 2xExchange 2013 servers in separate sites. Mailflow is working correctly, but the anti-spam content filtering is not working as ...
- 21
0
votes
1
answer
668
views
Exchange 2007 ignores whitelist (BypassedSenderDomains) when IP is found on a block list
On my Exchange 2007 machine I configured the IP block list provider to query
zen.spamhaus.org
bl.spamcop.net
dnsbl.sorbs.net
some of our business contacts or on those lists and get blocked by ...
- 7,059
2
votes
2
answers
6k
views
DNS and SPF configuration for Microsoft Exchange
We've started receiving spam with spoofed addresses from our own domain. So I'm trying to get my PTR and SPF records etc correct to prevent it. We're running Exchange 2010 on site with one server ...
- 253
1
vote
0
answers
144
views
Exchange 2010 still sending NDRs even when disabled
We have 2 Exchange 2010 SP3 Rollup 7 Servers in our organisation. 1 server receives all external SMTP mail. Both servers have AVG Email Server Edition installed and operational.
I have disabled '...
- 150
-3
votes
1
answer
766
views
Exchange 2013 Spam / Junk Email
We have an Exchange 2013 installation ready to go live in our organization. Due to budget restraints, our spam solution will be added in 3-6 months. We are going to use the built-in Anti-spam and ...
- 1
0
votes
1
answer
152
views
Exchange SMTP authentication issue with spammers
I have a single Exchange 2013 server with all the roles and it looks like it's being used by a botnet. It is sending mails every 10 minutes to a specific domain from a specific user.
It is not an ...
- 794
3
votes
2
answers
1k
views
Postfix - forward rejected by unknown recepients emails to SPAM-learning mailbox
I have Postfix + BitDefender FRAMS running as hygiene gateway before few Exchanges.
BD FRAMS can learn it's Baesian filter by download SPAM and HAM emails from dedicated mailboxes.
Because we have ...
- 53
2
votes
2
answers
2k
views
Mail not delivered from custom email server (MS Exchange)
I have my own Exchange Server 2013 (SP1). I am able to receive emails ok but sending emails is not reliable. Emails sent to gmail or seznam.cz (email provider in Czech Republic) is ok.
The problem is ...
- 73
-1
votes
1
answer
137
views
Exchange Server Spam Protection [closed]
I took over an exchange 2010 server on what I believe is a Hyper V Virtual Machine, running Windows Server 2008. We have a SonicWALL firewall, but the majority of the licensing on the firewall is no ...
- 191
1
vote
1
answer
196
views
create safe sender list based on domains of email recipients in Exchange
We're moving from Google Postini to Symantec Cloud as a spam filter.
In Postini we've managed to collect a total number of about 3400 domains added over the years to our safe sender list. But ...
- 13
1
vote
2
answers
2k
views
Quick/safe way to mass delete SPAM messages from 100+ inboxes
Looking for a way to delete all messages from particular senders out of every affected users mailbox, typically 100-200/10,000. When I approached our Exchange admins about this idea I was met with ...
- 11
-4
votes
2
answers
5k
views
Our exchange server is sending out a lot of spam [closed]
We have an exchange server 2003 and our IP address was blacklisted.
When I check the Queue folder in the exchange server root directory, there are tons of Delivery Status Notification (Delay/Failure) ...
- 135
0
votes
1
answer
505
views
Disable open-relay in exchange 2003 behind NAT
I have an exchange 2003 which is authoritative for my only one domain. It's in my DMZ and NAT'ed.
I am an open relay, sending thousands of spams. I want to stop it but I still want to receive email ...
- 1,916
0
votes
1
answer
90
views
Spamming from Exchange 2003
I am apparently spamming the world (about 1000 a day) but cannot figure out how. Mxtoolbox does not list me as an open relay and I have disabled all relays that I can find. I have run every virus ...
- 11
2
votes
1
answer
3k
views
Exchange Server 2010 Relaying Spam
Recently I began receiving AOL spam feedback reports from our exchange server. As I investigated I found that hundreds of spam messages were being relayed through our exchange server. Although I am ...
- 158
0
votes
1
answer
155
views
Is there a system-wide way to flag a message as spam in Exchange?
Every once in a while a spam message makes it into the network. The spam message might go to one or more recipients. When sent to multiple recipients, the emails are addressed only to individuals (vs ...
- 105
3
votes
1
answer
4k
views
Header to redirect to Junk E-Mail folder?
For Exchange 2007/2010, is there a header I can set outside of the Exchange organization, that once that message reaches the Exchange org, it will automatically be classified as spam?
The use case is ...
- 121