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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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Email Sender getting 550 5.7.1 Sender ID (PRA) Not Permitted when he tried to send email to us. when trying to send email to us (Exchange Server), he keeps on getting errors.

The response from the remote server was:
   550 5.7.1 Sender ID (PRA) Not Permitted

Final-Recipient: rfc822;
Action: failed
Status: 5.7.1
Remote-MTA: dns; (, the server for the
Diagnostic-Code: smtp; 550 5.7.1 Sender ID (PRA) Not Permitted Last-Attempt-Date: Wed, 20 Jun 2018 20:23:01 -0700 (PDT)

It looks to me that the issue is from sender's side caused by "spf Record". Am I correct?
If yes, anything that I can do on my side to help.
If no, what is the issue????

Dear Expert, please help
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Currently in my domain

I have already created MX record, butI do not know what should be relevant Incoming and Outgoing Email servers. I have already set up hMailServer in the server.

Domain is published in Namecheap. com properly while I am to set up Email server on my own server using hMailServer.
I have an Exchange 2016 Server CU9, fully patched. It is hosted on VMware (Esxi 6).

Last week we found a corruption in the mailstore (edb)... the error was as follows:

Information Store - MailboxDB1 (13604,D,0,15.01.1466.008) MailboxDB1: Data inconsistency detected in table Message_146 of database D:\Datastore\MailboxDB1.edb (1563448,293855).
Following this error are a sequence of other errors which ends with the store dismounting, it then remounts itself. works for 5 minutes and then the sequence of events re-occurs.

ESEUTIL crashed when ever we ran it

We used Veeam to restore the mail server to a date (3 days before) prior to the corruption occurring.

EVERYTHING was fine... server came back up, no errors. This was yesterday.

I have checked the logs today and some how EXACTLY the same error is happening, corruption in table message 146. same sequence of error and symptoms. How is that possible!

Before the restore we discovered a failing drive in the array that hosts the mail store, after some RAID firmware updates, we kicked the spare in and let it rebuild. (RAID 10 +1). we can see no other hardware errors. The other virtual machines on the server (Domain COntroller, File server) are fine.

ANy ideas or help would be GREATLY appreciated.....?
We will soon be starting a relationship with a company where we will be allowing them to send emails to our customers on our behalf from their mail provider using our domain name. They are using Amazon Ses, and they have asked us to add the domain as an allowed sender in our SPF record. We are going to do this, but I am a little uncomfortable with the risk of any potential Amazon cloud customer having the ability to spoof our domain and pass SPF. Because of this, I am looking into implementing DKIM and having the third party sign their messages with a private key.

I want to implement DKIM for our own domain's email messages as well. I have been reading up on DKIM, but it gets a little confusing when third party senders become involved. I am looking to see if anyone can provide me with a best practice for this situation.  If I create a private/public key pair for our domain, I am guessing that it is not recommended practice to provide that key to the third party and tell them to use the selector name I make up. I have come across different articles describing the use of multiple selectors, but I admit I am finding them confusing. Can I have two different private keys for the same domain? Then I could give them one private key for their emails and have a separate key for our emails? Do I use the same private key, but create two selectors for my domain? Then provide the third party with the private key and tell them to sign using the alternate selector? At that …

I hope you can help me with a serious problem with some spam email.

Background -

Our office switch the email to Office 365 the year before last. We have a number of email accounts on the Exchange server.

The address of one of the email accounts has been used by a bot-net to send out spam emails, and now the user is receiving 100s of bounced back undeliverable (error 550) emails.

The action center on Exchange Admin has identified that the email address has been involved with the spam, and has blocked the account from sending out emails, with the error-OutboundSpamLast24Hours=122;OutboundMailLast24Hours=134;OutboundSpamPercent=910;Last Message MessagetraceId:c401e900-91fa-4a20-66e1-08d5d7892e05

This, however, has not stopped the bot-net continuing to send out messages and, as I type this, the bounced back undeliverable messages keep coming in.

Our domain is not currently blacklisted on any mail blacklists, and I would like to keep it that way, but test messages sent out from other accounts in the office are immediately going into the Junk mail folders of GMail recipients because it says that a lot of messages from our domain are spam.

Below is the header of one of the messages returned.  I have determined that the originating IP is not ours.

Can someone please take a look at the header, and give me ideas on how I can stop the user's email address from being used for spam ?

The stars represent names of our servers and domain.

Any help is…
I am currently running Microsoft Exchange 2013 SP1 "15.00.0847.032" (CU4 2/25/2014) in a production environment. The Exchange Server is installed as a VM and I am also running an Edge server along side of it. (Same version and CU4).

According to this article by Microsoft. You don't have to install any previously released Exchange Server 2013 cumulative updates or service packs that were released before Cumulative Update 20 before you install Cumulative Update 20.

I am very trigger shy on upgrading to this CU. I know that there are some security updates that are included in the CU's but I am afraid that this CU will break my Exchange environment completely. Has anyone done a major CU like this or done a similar type thing with Exchange 2013?

I am running daily backups of my Exchange environment with Veeam, so there is that option if a failure were to occur also.
A user has been given full access to an Office 365 shared mailbox and also has full rights to send email from the Office 365 shared mailbox account.

What steps need to be followed to add this shared mailbox account to the user's iPhone X?

This user's primary Office 365 email account (which has full access to the Office 365 shared mailbox account) has already been set up within the iPhone X mail program on the iPhone X.

Can you people tell me the scenerios, why we add multiple domains in one office 365 tenant account?

What are the steps on how to setup Open Relay within Office 365?
What are the best free services for sending emails without SMTP authentication?

I need to configure my organization's WSUS server for sending notification emails and would prefer to use a free account that doesn't require SMTP authentication.

What are the best free services for doing this?
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I'm looking to integrate an external source of calendar items with our Exchange 2016 environment primarily so our managers can see the paid time off (PTO) approvals from our payroll company in an integrated way.  I thought it might be as easy as enabling external meeting messages on the shared calendar that's currently in use.  No go.  Apparently one can only enable external meeting messages on resource mailboxes.

Any ideas, thoughts or gotcha's on how to do this?

What is it within certain Outlook 2016 autocomplete email address entries that can cause emails sent to that email address to bounce (even though the email address is correct)?
As I understand, once we disable AD accounts of termed users, the exchange mailbox becomes disconnected.  Exchange will then keep the disconnected mailbox(s) for 90days or what ever the DB Limit is set. Once the that time is reached the mailbox is permanently deleted. Is there any way to recover the mailbox after that time ? Also, under the retention period box there is a check box - "Don't permanently delete items until the database is backed up". what does this do ? we have a single On-Prem Exchange2013 server.

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)?

We have a Cisco M4 UCS server configured with email alerts through the CIMC console and it works perfectly. Just bought 4 UCS M5 servers and put the management on the same VLAN and everything is a mirror of the M4 and cant seem to get the alerts to work via email for anything. We just configured a new NetApp SAN as well and the same issue with email alerts not working.

Odd thing is that all management ports are on the same VLAN  and only the M4 server works. We thought possibly a firmware issue, but since NetApp has same issue its not a firmware issue with the M5s.

We are running Exchange 2013 on premise.

Any suggestions?
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.

On the headers below you will see sent emails pass SPF and DKIM, but fail DMARC when received by Gmail. Any ideas what is going wrong?


Received: by 2002:a19:6a06:0:0:0:0:0 with SMTP id u6-v6csp4865968lfu;
        Tue, 19 Jun 2018 00:31:12 -0700 (PDT)
X-Google-Smtp-Source: ADUXVKL/xdFpCdXzeRfnikgQjajT7Otrism0aAtUXQIREtwH001nbCOGQQPVpfSn1qc99cmJBqi6
X-Received: by 2002:a37:2dc7:: with SMTP id t190-v6mr8369758qkh.229.1529393472479;
        Tue, 19 Jun 2018 00:31:12 -0700 (PDT)
ARC-Seal: i=1; a=rsa-sha256; t=1529393472; cv=none;; s=arc-20160816;
ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed;; s=arc-20160816;
Can i trace how my email passes through mailgateways.

For instance: we use Symantec mail gateway(smg) and Symantec cloud(messagelabs) in our company, i want to see how my email goes out to external domains , basically the flow of my email
My company is interested in delivery newsletter to it's costumer. Actually they are doing so with ccn mass mail but they can't personalize it (Dear, [name]...). Please consider that this is a really uncommon case: 100-500 recpits all interested in the content and max 10 mail in a year.

Our christmass mail get 98% of opening ratio and 43% of response. Yes, perople replied to our christmass newsletter.

Mail chimp was our first choice but leads to spam.

We are using outlook 2016 and exchange server 2016 on-premises.

I'm looking for an outlook plugin or phpbased tool. Is there any advice? A drag and drop builder whould be cool but not required. I'm also wondering how microsoft expect us to manage so. Publisher, Outlook, Word... There are many software can be used to create html template but none of them is good in distributing
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Dear Experts, in case of disaster, such as viruses, ransomware,... if we only have NAS device remaining and it only includes the Veeam backup files (.vbm, vbk, .vib files) of Exchange server; can we recover it?

If we cannot recover the VM, how can we rebuild it from those backup files. Can you please suggest a plan? Many thanks.

Veeam 9.5; Exchange 2016, Server 2012R2
How to restore back the delete shared Mallbox by powershell.
I am trying to send out an HTML news letter, and struggling with outlook. pictures and text are shown leveled on HTML, web base email clients, but not in outlook desktop
Recently took on admin duties for an on-premises Exchange Server 2010.

One of my Exchange users is not receiving an email he needs, and we suspect Exchange is filtering it.  (He's using a Mac, with the Mail app, not Microsoft Outlook, fyi.)

My question: what are the specific steps I would take to allow delivery of email messages from senders with addresses ending in
I am having trouble setting up a receive connector in Exchange 2016 for an internal application to send emails to external contacts using authentication.  I had this working fine but the other day I installed Recipient Filtering and now my internal application can't send email to external contacts.

I would like to setup a receive connector which sends mail to external contacts and uses authentication (External SMTP Relay with Authentication)

I have followed instructions on creating a new connector that are found on: but no luck so far.

Here is what is logged for the receive connector (logs are sanitized):
220 EXCH02.aaaaaa.lan Microsoft ESMTP MAIL Service ready,
EHLO proteus,
Tarpit for '0.00:00:05' due to '250 2.0.0 Resetting',
250 2.0.0 Resetting,
334 <authentication response>,
334 <authentication response>,
SMTPSubmit SMTPSubmitForMLS SMTPAcceptAnyRecipient SMTPAcceptAuthenticationFlag SMTPAcceptAnySender SMTPAcceptAuthoritativeDomainSender BypassAntiSpam BypassMessageSizeLimit SMTPSendEXCH50 SMTPAcceptEXCH50 AcceptRoutingHeaders AcceptForestHeaders AcceptOrganizationHeaders SendRoutingHeaders SendForestHeaders SendOrganizationHeaders SMTPSendXShadow SMTPAcceptXShadow 

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Running Outlook 2016 with Windows 10 (fully patched and latest versions) , items for today are showing up as Tomorrow in sent, received etc.
All my locales, time zones, date and time are all 100% - Australia English

Now this is where it gets tricky - The dates on the emails are CORRECT
The problem is the VIEW HEADING for DATE

That is, go to VIEW, select DATE and it should sort the email in headings under each date.
My today emails says tomorrow in all folders.

Email ServersSponsored by ConnectWise





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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