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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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We are using Exchange server 2016. I setup a "send connector" to use TLS, however it never uses TLS and the connection is always established on port 25.
What did I miss?!!
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Exploring ASP.NET Core: Fundamentals
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I am sending email from my server but now I get this error when I send to certain doman:

The following message to bixx@simnet.is was undeliverable.

The reason for the problem:
The address 185.152.x.x is not allowed to send messages for the address service@xxdot.is

Possible reasons for this problem:
- Wrongly configured SPF records on the sending domain.
- The email is being forwarded to another email address.

Please contact your email provider.
-------------------------------------------------------------
Those are my DNS records

MX            @      xxdot-is.mail.protection.outlook.com      
TXT      -      @      v=spf1 include:spf.protection.outlook.com -all      
CNAME      -      autodiscover      autodiscover.outlook.com
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Will MX fail-over occur if a 550 5.1.1 : User unknown error is encountered? In other words, if an SMTP client tries sending to the highest priority mail exchanger listed in the DNS record, and a user unknown error is encountered, will the client then attempt to send to a mail exchanger with a lower priority? If not, how exactly will it behave?
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For some reason, a user who has full access to all mailboxes is unable to expand other users boxes in Outlook view. Also his mailbox doesn't always open. When it is not in cached mode an error is displayed:
Non cached error when opening outlook
In cached mode the mailbox opens but usually complains that it is disconnected. Connecting to Exchange fails until it suddenly succeeds.

The problem is very similar as in this topic: https://www.experts-exchange.com/questions/29125111/Intermittently-cannot-open-Outlook-The-set-of-folders-cannot-be-opened-Network-problems-are-preventing-connection-to-Microsoft-Exchange.html 
However in my case the mailbox migration to a different database didn't help.

Our on premises Exchange environment was migrated from Exchange 2010 to 2016 and after that these problems have followed users occasionally. Setting a registry value to prefer IPV4 over IPV6 brought some stability but even after that we've had some reports of these problems. I have a feeling that the problem might be somehow MAPI related and it has to do with the amount of mailbox objects etc.. I know there is a registry value that is mentioned in some discussions that can be raised but others are against messing with Exchanges registry.

Now the full access user and it's mailbox is used for a software that needs to sync data from other users mailboxes. When the sync process tries to run an error is displayed:
Software User: username
PIM Account: username
Error Message: A MAPI related …
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Shared Mailbox calendar items shows up on another user's calendar when she is not invited. She is also not a delegate of this calendar,  but she does have and need full mailbox permission to this shared mailbox. No other user is having this issue. Any thoughts?
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Probably a basic one but can figure it out.
I am setting up a Postfix server to accept mail form our LAN and relay it to external WAN.

Mail sent from the LAN devices (MFC etc) get this error:

Remote Server returned '554 5.7.1 Client host rejected: cannot find your hostname, [172.16.255.89]'

172.16.255.89 is indeed the correct LAN IP. How do I authorize it ?
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Hi,
With setup below
6a.png
I cannot proceed to further step below. Please help.
6b.png
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I am Unable to send most emails to most domains. We are using Sophos XG as the sending relay.
All (almost all) emails are stuck in the queue with error:
421 service not available (connection refused, generic failure).
some emails that give these errors sometimes are getting delivered.
Problem started only yesterday!
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I am trying to set a Microsoft Live account in my Outlook 2010 but keep getting error.


I have my Desktop Outlook 2010 setup as the following:
In Outgoing Server >> enable: My outgoing server (SMTP) requires authentication
In Advanced >> Incoming server (POP3): 995 >> Use the following type of encrypted connection: TLS
Outgoing server (SMTP): 587 >> Use the following type of encrypted connection: STARTTLS

What I did notice that in Advance "Use the following type of encrypted connection:" says to use STARTTLS, but my Outlook only have 4 options: None, SSL, TLS,  Auto - I have tried all 3, no success.

Please let me know what steps to follow to setup a Microsoft Live account  in my Outlook 2010.
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I sent a message to a friend and it got rejected.  Here's the error I received.
Please help me decipher!
error
0
OWASP: Threats Fundamentals
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OWASP: Threats Fundamentals

Learn the top ten threats that are present in modern web-application development and how to protect your business from them.

We have a situation where our IPS and sometimes our SPAM filter blocks specific IP addresses that are sending mail from GMail and Google mail. In every instance these blocked IP's are on an Internet black list. Googles' solution is to white list these servers and any other Google servers (literally thousands of them), this is insane to me. I am sure others have encountered this situation and I am wondering how do you handle it.
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Using Onedrive email alerts for shared documents are turned on by default.
email notification in one drive is on by default for shared files
Shared doc with colleague.

Watched him open and edit it in Office365.

Got no email update.

What do you think is happening?
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Dear Experts, is there anyway to search exchange mailbox with exact time range?

For example I 'd like to search an email with ketwork "abc" in content and was received before 2.45pm of 26 Dec 2019?

I tried Search-mailbox command on Exchange 2016 but it did not work
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Dear Team,

 My AD and exchange setup are crashed and the setup is not working anymore.
The exchange was on 2013.
Since i had to start the mail working, i created a new setup with New AD and Exchange.
I recerated all the users and Mailbox and the emails are working now.
The problem is all the old email is missing. Luckly i have the old Databse EDB file of the crashed Exchnage.

Is there anyway i can connect the EDB and copy back the old emails to the Malboxes created in New Exchange 2019.

Your help will be highly appreciated.
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Hi,
How to resolve version below, as I did copy the file from the path below?

C:\Program Files\MySQL\MySQL Server 5.7\lib

0a.png
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Is use DMARC and SPF to protect my domain, however a client recently became infected with malware and propogated the malware via spoofed email.  Now clients of mine are receiving mail addressed as me.  The question is how, what have I missed here.

Details
DMARC Record
v=DMARC1; p=none; rua=mailto:helpdesk@mydomain,mailto:7ffa0582@mxtoolbox.dmarc-report.com; ruf=mailto:My.name@mydomain,mailto:7ffa0582@forensics.dmarc-report.com; fo=1

SPF
v=spf1 +a +mx +ip4:M111.111.111.111 ~all
where
  • IP is my public IP address
  • MX is my cload spam filter provider.
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We are planning to set up DKIM for a mail domain, example.dk.
I can find a lot of good advice on the Internet. But there's one question I can't find an answer to.
We Use Exchange online for most of our mail, but we also have an on-premise SMTP server for routing mails from our webservers. And we are using a cloud service for our news letter service. How can DKIM be set up when there's multiple systems sending mail from our example.dk domain?
All the guides I have found on the Internet are about a setup with only one mail system.


Best regards Holger Nielsen
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Mobile mail is saying cannot verify identity so users are not getting email.
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Hello Expert

My Customer have migrate to an Exchange server and everything went well.
But when they are trying to check email on the Outlook App on mobile they cant see anything, but the Outlook 2016 is working fine.

Anyone can point me in rigth directions?

Thanks you
0
Learn Ruby Fundamentals
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Learn Ruby Fundamentals

This course will introduce you to Ruby, as well as teach you about classes, methods, variables, data structures, loops, enumerable methods, and finishing touches.

A monthly email to me from a company is reported at their end as having been sent, but I don't receive it. It doesn't go into my spam, and the sender along with their IT dept., don't think they are at fault.

Any ideas what I might try to look for or suggest to them as an investigation into this, or a solution?

Thanks,
k.
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Hello Experts

I am configuring Exchange for a lcient who nees DKIM
I never configure this before
The customer told me that he can generate DKIM keys for the domain

how do i use this on EDGE server?
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We have dmarc implemented and I usually collect and review the reports weekly. About 3 weeks ago, the number of threat reports massively jumped and remains alarmingly high. Looking at a 2 month period: October-November, 7k emails passed dmarc, 70k have been reported as threats. This all looks like someone external has tried to use my domain and is failing the spf and dkim checks and I am getting the reports about it. I expect dmarc is working as it should but the volume of emails and the sudden increase around 3 weeks ago is what has got be concerned. Unfortunately I have had no reports from humans in that time of fake email coming from my domain. I do not even know the content of the emails or the recipients. All I know from dmarc is that they exist. My dmarc policy is set to quarantine rather than reject so conceivably people are still seeing the emails. I would appreciate any advice from the email experts here.
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Dear Experts

As per the policy we must deploy on-premise email server and we are planning to go for exchange enterprise or standard.  However our user base is 20 users at present and we may maximum have 25 to 30 users in next 5 years. We are planning for barracuda email security appliance.  
1. Please suggest is it recommend going with exchange standard OR exchange enterprise
2. As security point of view we should have tight security hence will there be any difference between standard and exchange
3. Understood standard will provide 5 mail database will this be sufficient for 25 to 30 users
4. What all features that will not be available in exchange standard compared to exchange enterprise.
please help, thanks in advance
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I had this question after viewing can I disable Delivery Status Notification for delayed messages and/or undelivery messages?.

How can we do it in Exchange 2016, do we have to restart any service after that?
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I work for a school and it's important that all correspondence to parents about their child is also copied to a central mailbox that stores information about students organised into student subfolders.

Teachers often forget to CC this mailbox so I wrote a Mail flow rule that automatically copies the email to StudentInfo if the recipient is one of 1600 email addresses. Unfortunately the rule couldn't be created as it contained 75000 characters and the maximum number of characters allowed is 8192.

I could split the rule into 10 smaller rules A-C D-F etc but then I thought is this the most efficient way to achieve this?

Can anyone suggest a better/simpler way of achieving this? Otherwise I'll just get on with creating the ten or so mail flow rules. Thanks in advance.
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Email Servers

25K

Solutions

21K

Contributors

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.