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Email Protocols





Interactions between email servers and clients are governed by email protocols. The three most common email protocols are POP, IMAP and MAPI. Most email software operates under one of these (and many products support more than one).  The correct protocol must be selected, and correctly configured, if you want your email account to work.

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A user who used to be an Office 365 global administrator receives "Identity synchronization Error Report" emails. She continues to receive these emails even though her global administrator role was removed a month ago. Now she is just a standard Office 365 user without any administrator roles.

Also even though I am an Office 365 global administrator I don't receive these email notifications nor do other Office 365 global administrators within our organization.

Where within Office 365 do I need to go to edit who receives these and other Office 365 error message and notification emails?

Office 365 sync errors email
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We have a legacy software that does not support TLS so we relay the emails via an IIS relay that authenticates and send out via Office 365.

Emails to certain recipients are bouncing with the NDR 550 5.6.11 SMTPSEND.BareLinefeedsAreIllegal

This has just started recently about 2 months ago .

This Microsoft links explains why -

 What's a bare line feed in email messages?

Usually each line of characters in an email message ends with a carriage return followed by a line feed (CR LF). A bare line feed is a line feed (LF) character that is not immediately preceded by a carriage return (CR) character. In other words, instead of a line ending with CR LF, it ends with only LF.
This worked fine before, why did it stop working recently?

Until recently, Office 365 automatically removed bare line feed characters from mail to help it get delivered to recipients using older email servers that don’t support chunking and the BDAT command. The support for BDAT is required by the email industry standards referenced in RFC 1830. In an effort to better support security standards, like DomainKeys Identified Mail (DKIM), Office 365 no longer removes bare line feeds from messages. As a result, messages sent to users with older mail servers may be more likely to be rejected.

Their suggestion is to make changes on the recipients server which is not possible so what can I do on our end to fix this?
When a user within our organization sends a certain Power Point file as an email file attachment using Outlook 2016 the email arrives in the recipients Inbox but the Power Point file attachment is no longer attached to the email.

We believe this is happening because Office 365 detects malware or some other type of problem with this Power Point file attachment. This file attachment is well within the file size attachment quota limits.

The sender doesn't receive any type of notification saying that the file attachment has been dropped or quarantined and the persons receiving this email don't know that the email was supposed to have a file attachment.

What can be done to change this so that if Office 365 ever drops a sender's file attachment the sender will receive an email notification that the file has been dropped or quarantined?

Is it also possible to make it so that the persons receiving this email will also be notified that the email they have received has had the file attachment dropped or quarantined?
We are having an issue where users are not receiving delayed delivery status emails but they are receiving failed delivery notifications.  The option is set to notify sender when message is delayed by one hour but no one ever receives it.  Any ideas?
Our client (a sort of golf travel company) in the UK regularly sends out email worldwide to their clients. They are now receiving bounce-backs in German, making it difficult for my client to resolve them. The user sending the orginal emails is ccarugati@iagto.com

I have contacted  the ISP (Fasthosts in the UK) and they understandably say "This would only happen if the e-mail you are sending to is hosted on a German server as the bounce back is sent from the server rejecting the e-mail." however, our client receives these from all over the world always with the same formatting, so they seem to be coming from the same generating program, if not the same server?

I attach some of the bounce messages (they're in Outlook Item file format).

I suppose the other issue is what are these, or what's causing, the bounce-backs in the first place?

I am sure those of you who "enjoy" trawling through email bounce headers will find this a fun challenge :-)

I’d like to reduce the Spoofing SPAM by enabling DKIM and DMARC, so I need your assistance in how to implement this to all of my Exchange Server accepted email domains ?

Note: I am managing my Public DNS server On Premise running on the Windows Server box, so I can have access to the records myself.

From my understanding, I can just add the below entry:

DKIM: Create a CNAME record for k1._domainkey.mydomain.com with this value: dkim.mcsv.net
SPF: Create a TXT record for domain.com with: v=spf1 include:servers.mcsv.net ?all
DMARC: … not sure

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But I need further detailed steps if any.


Can anyone here please assist me with the below issue where my internal user gets NDR with the below error message:

Diagnostic information for administrators:
Generating server: smtp1.aws.moneyworks.com
Remote Server returned '<mail.domain.com #5.7.1 smtp; 554 5.7.1 Error: need authentication from>

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Any help would be greatly appreciated.


outlook email alerts not coming. How keep alerts so that when email comes popup comes and also preferably some sound comes?
please advise
"The Name on the security certificate is invalid or does not match the name of the site"

We have a user who is experiencing this error when traveling . Problem only occurs when connecting to MS Outlook via a hotel or public wifi, but not all of the time.

Similar issue occurred two weeks ago on the same user's cellular phone (as well as a coworker he was traveling with). Both employees were out of state when this happened

  • We have other employees who travel out of state who have reporting nothing
  • We are on Exchange 2010
  • User is on Outlook 2010 client
  • Validated with Godaddy, our certificate issuer that the certificate is perfectly fine
  • Validated with MXToolbox that mail autodiscover resolves fine
  • User connects perfectly fine from home, which is also out of state (remote worker)
  • Issue began two weeks ago, making this problem seem like more than a coincidence

If there's anything else I should be looking at, I'd love to know! TY -Dave
When I email users from one particular company domain (and only that domain) they get my email from my company domain email, but when they reply (and also if they just directly write to me)  it doesn't come to my company email, even though on their outbound email that is what shows as the 'to', instead it arrives in my personal yahoo email, even though the sender couldn't even possibly know what my personal yahoo email is.

This happens for any sender from this particular company to me, but the same doesn't happen when that company sends emails to anyone else in my company, they work fine. They also say they never had this problem with anyone else. I do not have any forwarding of any kind of redirect set up in my email system. None of my other colleagues have any issues receiving emails from this company.

Looking at the header of the message I receive it shows

X-Apparently-To: m_xxxxx@yahoo.com; Thu, 27 Jul 2017 07:39:28 +0000
Return-Path: <asxxxxx@sender.com>
Received-SPF: pass (domain of sender.com designates 104.4xxxx as permitted sender)

Authentication-Results: mta1209.mail.bf1.yahoo.com  from=Sender.com; domainkeys=neutral (no sig);  from=groups.office.net; dkim=pass (ok)
Received: from  (EHLO EUR01-DB5-obe.outbound.protection.outlook.com) (xxxx)
 by mta1209.mail.bf1.yahoo.com with SMTPS; Thu, 27 Jul 2017 07:39:27 +0000
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;
d=sendercom.onmicrosoft.com; s=selector1-sender-com;

From: Asxxxxx…
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Help! I spent a few hours drafting a long heartfelt email to my children and when I hit save it save draft. Now I have gone to my saved draft folder and it is not there. Is there anyway to still retrieve it or am I sunk?
Dear Team, does anyone know how to configure 2 steps authentication in Exchange mail server? Is it possible? many thanks in advance.
I would like to make a parse of postfix mail log in an HTML/PHP page with a search bar and then creating a dynamic table with all these tags. when the table is done I should be able to click on the "Date" and another page should open with others info about that log *(2)

I will copy an example of a log

search: from: ...... to: ...... date: from: .... to: ....

Eg Table example: Date | time | from: Jack | to: John | status:


status detail

809318:Jul 11 14:13:50 amail-2014 postfix/smtpd[17127]: 78F5E83F28: client=mx0a-00164e02.pphosted.com[]
809320:Jul 11 14:13:50 amail-2014 postfix/cleanup[18135]: 78F5E83F28: message-id=<ADR420000021230890209457A56BCF141EE799C64C575B380E1C@molex.com>
809324:Jul 11 14:13:50 amail-2014 postfix/qmgr[27711]: 78F5E83F28: from=<NO-REPLY@MOLEX.COM>, size=30390, nrcpt=1 (queue active)
809325:Jul 11 14:13:50 amail-2014 postfix/smtp[11782]: 78F5E83F28: to=<*****@SYLEX.SK>, relay=mail1.sylex.sk[]:25, delay=0.73, delays=0.59/0/0.01/0.13, dsn=2.6.0, status=sent (250 2.6.0 <ADR420000021230890209457A56BCF141EE799C64C575B380E1C@molex.com> [InternalId=50607599648815, Hostname=SYXEX01.sylex.sk] Queued mail for delivery)
809326:Jul 11 14:13:50 amail-2014 postfix/qmgr[27711]: 78F5E83F28: removed
809323:Jul 11 14:13:50 amail-2014 KLMS: not processed: …
I got a mail from capgeminioffers.in@capgemini.com was it real or not please tell me
I have one client that cannot email me.. They receive a bounced back message saying;

550 Verification Failed
No such user here
Sender verification failed

I can however email them. But they cannot reply.

None of their emails from their domain raywhite.com will come through, however I have been guaranteed from my ISP (crazy domains) that there are no blocks on my end. However i do know of another company who are with crazy domains are experiencing the same problem with the Raywhite.com server  

As I run my ow  business, my only option is to change hosting companies in the hope that works.

Would love an easier fix
Hi All,

May I know where shall I manually add the below entry if I handle the Public DNS using Windows Server box in my DMZ ?

DKIM: Create a CNAME record for k1._domainkey.MyDomain.com with this value:

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SPF: Create a TXT record for MyDomain.com with:
v=spf1 include:servers.mcsv.net ?all

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What is the risk or issue when implementing it during the business hours ?

Facing an issue with one company, that I can't receive email from them !!
Wwe have our own mail server as they do , they have Exchange Server as they mentioned,and we have SPAM Filter Appliance but the email never reaches SPAM Filter in order to be checked and sent to Our Mail Server.
Our Domain is hosted  with hosting company and they are pointing MX Record to our public IPs .

What are the steps to troubleshoot the issue ?

Thank You
Dear All,

I have a question. When my clients send their transactional emails using my provided SMTPS, I process the MTA logs to generate bounces and track emails. I need some guidance here, how would I put my web application in the middle of MTA and the client so if any client sends any transactional email using the provided smtp, it pushes the email to my application first and then my application pushes it to the mta after filtering it.

Thank You
I am receiving the following error when truing to setup Microsoft Exchange 2013 on a new server. I have followed all of the instructions noted in Microsoft's guide:
However when I run the installer it throws this error when setting up the "Mailbox role: Transport service."

The following error was generated when "$error.Clear(); 
            if ($RoleProductPlatform -eq "amd64")
                $useAttachMode = $false;
                $fastInstallConfigPath = Join-Path -Path $RoleBinPath -ChildPath "Search\Ceres\Installer";
                $command = Join-Path -Path $fastInstallConfigPath -ChildPath "InstallConfig.ps1";
                $fastDefaultDataFolderPath = Join-Path -Path $RoleBinPath -ChildPath "Search\Ceres\HostController\Data";
                $dataFolderPath = $fastDefaultDataFolderPath;
                if ([System.IO.Directory]::Exists($fastDefaultDataFolderPath))
                    $useAttachMode = $true;
                    if ($RoleIsDatacenter -eq $true)
                        $preferredDataFolderPathRoot = "D:\";
                        if ([System.IO.Directory]::Exists($preferredDataFolderPathRoot))
                            $dataFolderPath = Join-Path -Path 

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Hi All,

Our environment runs exchange 2010. Recently we have found that we are unable to set up SMTP on devices (scan to email on copiers, email notifications on various things). Details are entered in correctly at the device but the test always fails with a generic error (unable to send email) etc.

Some other devices on the same network seem to be able to send SMTP notifications without issue (e.g. our UPS). If I copy the exact SMTP details in a device that isn't working, to one that is. The email sends, indicating to me that the actual settings are ok?

The only reason I can think of to cause this would be that some devices require something additional that our Exchange Server doesn't have configured?

We have no known issues with our Exchange server. I've had a look at "Receive Connectors" in Exchange, and tried adding in a new receive connector for the IP address of a device that isn't working, but it doesn't seem to solve the issue.

What should I be looking at to ensure that all devices within our network can communicate via SMTP?

I have tried testing SMTP using a few tools, using "bmail" from here: http://retired.beyondlogic.org/solutions/cmdlinemail/cmdlinemail.htm

I can successfully send an email from any made up address to a valid address in our organisation using the below example command:

C:\> bmail -s MyServer -t recipient@acme.com -f me@mydomain.com -b "This is a test" -h -a "This is the subject"

That works.

Using TELNET and …
I changed the password on a gmail.com account and now it is failing.  It keeps asking me to put in the log in and password and when it tests an email, it fails to connect to server.  I have tried deleting the email and reinstalling it.  It won't reinstall it.  I have tried using the old password.  Nothing is working.
I am setting up an email account on Outlook 2016 with IMAP server settings.  When I delete a message I want it to go to the delete or trash folder but remain available for future reference.  Is there a difference between trash & deleted folders?  I have UNchecked both boxes in the "deleted items" for internet email settings".  Thanks in advance for your thoughts!
I have a Server 2012 R2 with Intel Active System Console running.
I want to receive emails on Critical Events.
I need to configure Mail Server Address, User ID, Password and Recipient Email ID.
I use my ISP's SMTP server address for the Mail Server Address.
It doesn't require authentication but I am forced to put in a User ID and Password.
There are no options for configuring ports or encryption.

What User ID and Password do I use? The one I use to log into Intel Active System Console or one for the email server?

How do I test this is working?
I have Dropcam (now Nest) forward mail to three different email addresses.  Often, one relay entity is very slow (just now, 111 minutes).  This is usually "yourhostingaccount.com."  Why and what should I do about it?
I want my mail address back fps.noh@gmail.com

Email Protocols





Interactions between email servers and clients are governed by email protocols. The three most common email protocols are POP, IMAP and MAPI. Most email software operates under one of these (and many products support more than one).  The correct protocol must be selected, and correctly configured, if you want your email account to work.