Email Servers





Within Internet message handling services (MHS), a message transfer agent or mail transfer agent (MTA) or mail relay is software that transfers electronic mail messages from one computer to another using a client–server application architecture. A MTA implements both the client (sending) and server (receiving) portions of the Simple Mail Transfer Protocol (SMTP). The terms mail server, mail exchanger, and MX host may also refer to a computer performing the MTA function. The Domain Name System (DNS) associates a mail server to a domain with mail exchanger (MX) resource records containing the domain name of a host providing MTA services.

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I get every day a spam mail the subject is the same(subject= Mr.Jan) but Domains everytime different . I blocked a Domain then Comes from other Domain.

What to do ? I have Exchange Server 2013 Enterprise

Do i Need to block somehow only SUBEJCT (Mr.Jan)?

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I am researching how to change our exchange send connector to send outbound email through our spam appliance. We are doing this for compliance reasons. Any suggestions on what all I need to change as far as DNS, and mail routing would be much appreciated. I have recently taken ownership of our spam and email servers so I am somewhat green when it comes to major changes like this in a production environment.

Our Environment:
3 Server Exchange 2013 DAG.
3800 End Users.
DNS Roundrobin.
All inbound mail goes through the spam appliance.
We have purchased licensing for out bound mail filtering.
An important user within my organization received NDRs while replying to emails sent by someone outside of our organization.

We are using Outlook 2016 and Office 365 as our email server.

However, later on the same day, someone else within our organization was able to reply to the exact same emails and these emails reached the person outside of our organization without any problems.

Neither person sending these emails had any attachments sent as part of these email replies.

Since the person we are emailing outside of our organization is a very important person we can't send any test emails or reply to any existing emails to simply test if this issue has been resolved.

So are there any ways we can simulate sending or replying to an email to this person outside of our organization to see if the original issue with the user within my organization had with sending emails to this outside user has been fixed?
Different employees at our company have had a problem with a large number of malicious outbound emails sent out from their company email address, causing our email service provider to shut off our service until we reset every account's password.  This has happened 5 times now.  When you look at one of the employee's Outlook programs, you don't see the malicious emails in the sent items, you only see the "bounce back" emails in the inbox, reporting that the email wasn't accepted by the recipient.  Neither McAfee nor Malwarebtyes detects malware on the employee's computer.  How can we figure out how these malicious emails are being sent out using the company's email addresses of our employees?  Could undetected malware be running on some of our computers that gives an outside person email passwords that he/she is using to send malicious emails from our accounts?  Is it more likely that our computers are sending out the malicious emails even though they aren't being logged in the sent items folders?  Could someone be intercepting our unencrypted emails and extracting the email password from them?   We have McAfee Orchestrator and a Fortigate 101E firewall appliance?  Could either of these things be used to troubleshoot the problem?
I have a user who is trying to send to a group and received the following error. I am using exchange 2010 and have decommissioned exchange 2003. This is an internal email

Please note i have already checked below and authentication box is unchecked
go into emc - go to the mailbox - right click - go to properties - go to mail flow settings - message delivery restrictions and see if the authenticate box is checked

Error Message is below
Delivery has failed to these recipients or groups:

Staff (
Your message can't be delivered because delivery to this address is restricted.

Diagnostic information for administrators:

Generating server:
#550 5.7.1 RESOLVER.RST.NotAuthorized; not authorized ##

Original message headers:

Received: from ([::1]) by ([::1]) with mapi id
 14.03.0382.000; Thu, 7 Jun 2018 12:10:37 +1200
Content-Type: application/ms-tnef; name="winmail.dat"
Content-Transfer-Encoding: binary
From: Principal <>
Subject: Student Celebration Assembly Monday 11 June
Thread-Topic: Student Celebration Assembly Monday 11 June
Thread-Index: AdP981PmPsAi3MEtQpmfzJ8HC3JciA==
Date: Thu, 7 Jun 2018 12:10:36 +1200
Message-ID: <>
Accept-Language: en-US
Content-Language: en-US
X-MS-Has-Attach: yes
X-MS-TNEF-Correlator: <>
On a recently upgraded win 7 home to Win 10 home desktop PC, user uses AOL webmail.

says that from some users, when they expect an XLS or DOC /DOCX file(s), they ONLY get a file ending in WDL extension.  That's a text document that has the expected file name - kinda like a packing slip in a box.  But that's all that's attached. Not the expected file, just this packing slip text file with the WDL extension.

I told them to have the sender resend and include me.  But sender is a law firm / concerned with confidentiality (but yet, he's using an AOL address : )

So we set up a gmail account and the sender will send to both the aol and gmail accounts and we'll see if it's a sender issue.

I asked if the sender is a new employee (doesn't know how to send attachments?) - the user said no
Did the sender start using a new email system that includes a link to a secure website to get the attachment - the user said no
Are the files too large? Supposedly no.  There's a number after the file name, supposedly the file size?  in one email, it was 256.  (bytes?  KB?)

Any thoughts on why someone would get a WDL file rather than the actual file?  Yes, there's loads of ways to approach this / try troubleshooting. But getting the sender to send emails / answer questions about what they are using to send, etc. is hard.  so trying to figure things out with limited info.

googling, it doesn;'t come up with anything about attachments / emails.  WDL is some gaming file extension …
I have some blockage on my iCloud email

I do not understand why, but certain emails do not show up on my iCloud account.

I logged into and saw no error or sign it was  not working. But I do know that certain emails have been lost. Such as, my WordPress site has an outbound email with a PDF attached. I pulled my hair out with the email not showing up until I used my trusty GMail.

Other things I fear are also blocked.

In my ThunderBird (Mac) for the iCloud email, there is no SPAM folder. So, perhaps it is being flagged somewhere as SPAM, but not visible either on ThunderBird or online at


Running Exchange 2010 with MS outlook 2010
 I have a share mailbox call  ( in my inbox has an auto forward all mails to my inbox.

what I need is a rule that will move (filter) the email that is auto forwarded to a specific subdirectory in my personnel inbox in  Outlook 2010

Screen shot attached.
One of my friend's organization moved to O365 a couple of weeks back (85 users only). They were using on-premise exchange 2010 SP3  with Windows 2008 R2 Domain.

They have on premise AADserver now to sync to 365.

Now they do not have any more on-premise exchange but the other day he called and informed that while he was cleaning up his AD, he found  3 of the following exchange   remnants.

CN=Configuration,DC=Domain,DC=Com -> CN=Services -> CN=Microsoft Exchange

CN=Configuration,DC=Domain,DC=Com -> CN=Services -> CN=Microsoft Exchange Autodiscover

DC=Domain,DC=Com -> OU=Microsoft Exchange Security Groups

Now my question is, can he delete these from his AD? Because within a month he gonna migrate to windows 2016 AD. Please find the attachment he sent.
I am looking to put a Secondary MX server offsite.  We have frequent power outages and we are a small company so we have no backup generator. The UPS’ only last so long.  I have been looking into putting a Secondary MX record that would point to a off-site exchange to cache the mail if the primary was offline we have a DAG currently setup but all the info I have seen say a backup server with a higher MX value is very easy to spam and spammers will regularly send SPAM to it.  My question is can I do spam filtering on the backup server just like the CAS server does or can I set it up for when the primary site comes back up the mail will be delivered to the CAS server so it can be filtered?  Any ideas would be great.  I am currently on Exchange 2010
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How to send large files for free?

I use WeTransfer but that limits files to 2 GB.

What other free options allow a large filesize?


I'm looking to implement SPF, DKIM and DMARC at my current client.

SPF has been implemented in a soft fail configuration until all mail servers are identified. They have the following setup:

Exchange 2010
Mimecast - through which the vast majority of email is sent
An external provider (esendex) is used to send certain emails -

THe Exchange servers and Mimecast dns entry has been added to the SPF.
Esendex record\server information will be added to the SPF once received.

As my client has a legal services division they need to know that by implementing DKIM, emails will not be blocked by recipients. Whereas SPF has a soft fail configuration, I can see no such config for DKIM. The actual creation of the DKIM keys seems v straightforward for Mimecast. Will I have to create a separate key for Esendex?

Do mail providers reject messages if the DKIM signature doesn't match? Is there a way to check those who do and don't from the main players?

What is the best way to implement DKIM with testing prior to making it live? All I can find are checking tools to use once the record is in place. They won't take that risk. I could state the case for a test email domain but at most I could only send email to the main providersd and see what happens.

I have also seen reference made to setting up a DMARC policy of none prior to setting up SPF and DKIM - is there any merit to this?

Hi Experts,

We have the following function that used to work for years, now suddenly its starting to cause problems.

Public Sub SendEmail(Optional sTo As String = "", Optional sFrom As String = "", Optional sSubject As String = "", Optional sBody As String = "")
    Dim imsg As Object
    Dim iconf As Object
    Dim flds As Object
    Dim schema As String

    Set imsg = CreateObject("CDO.Message")
    Set iconf = CreateObject("CDO.Configuration")
    Set flds = iconf.Fields

    ' send one copy with SMTP server (with autentication)
    schema = ""
    flds.Item(schema & "sendusing") = cdoSendUsingPort
    flds.Item(schema & "smtpserver") = ""
    flds.Item(schema & "smtpserverport") = 3535
    flds.Item(schema & "smtpauthenticate") = cdoBasic

    flds.Item(schema & "sendusername") = ""
    flds.Item(schema & "sendpassword") = "MyPWD"
    flds.Item(schema & "smtpusessl") = False

    With imsg
        .To = sTo
        .From = sFrom
        .Subject = sSubject
        .HTMLBody = sBody
       '.Sender = "Sender"
        '.Organization = "My Company"
        '.ReplyTo = ""
        Set .Configuration = iconf
    End With

    Set iconf = Nothing
    Set imsg = Nothing
    Set flds = Nothing
End Sub

Open in new window

See attached error message.
I have long used the free gmail for mailboxes. In the "Send mail as" section, I add an additional email account and tick the box "Treat as an alias". I then configure the emails to be sent out through the SMTP server and then use the default gmail address as the username with its accompanying password, using TLS and Port 587.  It is also necessary to set "Allow less secure apps" to ON. (I recognise that this is not a great system but I do not have the authority to change it.)

This has worked fine until today when it was no longer possible to send email out from the alias.  I receive a "Message not delivered"  reply and the following message:
"You're sending this from a different address or alias using the 'Send mail as' feature. The settings for your 'Send mail as' account are misconfigured or out of date. Check those settings and try resending."

I discovered that the "Allow less secure apps" was now set to OFF. I changed it back to ON, assuming that this would resolve the issue but I still receive the same message.

Has anyone else seen this problem and can suggest a solution?

Thank you
Emails sent to bounce with the message "requested mail action aborted"

Is there a fix, or is this a "no such account" error
I have two separate Exchange 2016 organizations with three member DAGS experiencing an issue very close to this one here:

I have failed and suspended passive copies on the remote DR DAG members and when I attempt to reseed, I get the error:

The seeding operation failed. Error: An error occurred while performing the seed operation. Error: Failed to notify source server  about the local truncation point
0xc8000713. Error: Unable to find the file.

However, the logs DO appear to be and are being truncated so I am not sure if the guidance presented in the above referenced article or others on the internet like it is applicable to my situation. I could understand if the logs were not truncating but the backup software is truncating them. Also, I would really like to avoid having to dismount so many databases and manually remove so many log files. Though I don't even know what files I would remove since the only log files present are the current ones.  Any and all thoughts or ideas would be greatly appreciated.
Need to find Info on whether a particular email was read by the recipient in 365 Message Encryption (OME).

We use 365 message encryption to allow users to encrypt emails out to external users. The external user will receive an attachment that they open and then they need to either login (with the recipient email address) or use a one time passcode (sent by Microsoft) to allow them to read the message online. Because the attachment contains the link to read it online, there is no read receipt in 365 for this type of message delivery. We see in Message Trace that the message was delivered (the message notifying the recipient of an encrypted email), however we do not know if they opened the attachment and read the secure email. I would think Microsoft has a way to view this information, however I have been unable to get any results from support.

Is there a way in 365 to find out if the encrypted message was read?

For security reasons, if a message was sent securely to the wrong email, we need to know if it was read or not.

*Extra credit: Is 365 ever going to come out with read receipts on there encrypted emails like other providers??

Thanks in advance to anyone who might know more about this... it seems to be a black hole.
I need a cron job that will export some MySQL data to CSV, then send the result by email.
by simple SELECT query. The issue I'm having is the email is stored in a different table from the the csv information. I have a current csv file that exports then sends an email but it it can't be done automatically, it needs someone to click the download button then it will email. Any help would be greatly appreciated. Thank you in advance.
We are currently migrating from Exchange 2010 to Exchange 2016 and it looks like the distribution groups were never upgraded to the Exchange 2010 version when an earlier migration was performed from Exchange 2003 to Exchange 2010.  Before decommissioning Exchange 2010, I would like to upgrade the distribution groups.  

Are there any known issues with upgrading the distribution groups in this scenario, that is, upgrading the distribution groups to Exchange 2010 version in a coexistence environment of Exchange 2010 and 2016? I am planning to run the command below:

Get-DistributionGroup –resultsize unlimited | Set-DistributionGroup –ForceUpgrade

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I am looking to migrate Exchange 2010 public folders to Exchange 2016 public folder mailboxes.  Given that public folder replicas are no longer supported in Exchange 2016, is it a required step to remove all public folder replicas before performing the batch migration?  I am concerned that if I remove the public folder replicas before the batch migration, that users will be going across the WAN for public folder content and experience slowness.
Hello, I had a few questions regarding the migration to public folder mailboxes from Exchange 2010 to 2016 with multiple sites:

1) In Exchange 2016, does the concept of public folder replicas still exist?  We have users from multiple sites that need to access the same public folder content.

2) If public folder replicas are no longer a feature, that means there is only one active copy of each public folder available.  What are the best practices for public folder mailboxes if users from different sites need to access the same public folder?

3) If a user's mailbox is in DAG "A" and a public folder mailbox is in DAG "B", can the user access the public folder mailbox even though they're in different DAGs?
Hello gents

I am planning to configure Exchange Hybrid for a Customer . There is this requirement about autodiscover properly publish
how can i check that autodiscover is properly publish for a domain?
Upgrade: CRM 2011 to Dynamics 365

I am working on setting up server side sync for a Dynamics 365 server.  I have access to the email router settings from CRM 2011 so that I can use the Email Router migration tool.  

I am able to open the active mailboxes in Email Configuration but when I run Test and Apply nothing happens.  It does not show failures or success, just not run

I have also tried Approve but there are no Alerts

Any assistance would be appreciated.
Questions about Thunderbird (Mac)

Can I Collapse All email accounts? I do this manually, and hate all the clicking...

Also, can I re-arrange the Email accounts?

I do not want to Delete them all, then need to recreate them all, then find I have a New Email account and need to do it all over again.

I want them grouped in some fashion.

Hi I Need to Find all the email addresses only, that were received into an Exchange 2013 mailbox, is this possible in Power shell to do and export them to a csv so i can use as a group mail shot

Email Servers





Within Internet message handling services (MHS), a message transfer agent or mail transfer agent (MTA) or mail relay is software that transfers electronic mail messages from one computer to another using a client–server application architecture. A MTA implements both the client (sending) and server (receiving) portions of the Simple Mail Transfer Protocol (SMTP). The terms mail server, mail exchanger, and MX host may also refer to a computer performing the MTA function. The Domain Name System (DNS) associates a mail server to a domain with mail exchanger (MX) resource records containing the domain name of a host providing MTA services.

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