Email Protocols

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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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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.
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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?
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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?
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What does the NDR code 550 5.7.360 mean?

A user received an NDR with this code in the email NDR which said that the email couldn't be delivered.
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We have recently migrated from an internally hosted Exchange 2010 to offie 365 for education.


Currently our exchange is still present, but only for the purpose of SMTP relaying from our applications. I believe this is causing problems because of our SPF record.

I would like to know is it better (or even possible with the free/educaiton licensing.) to use office 365 for relaying. or should i just adjust my SPF records and continue to use the internal relay.

If the answer is adjust SPF record. can i please get some guidance on the exact syntax ?

currently it is setup as: v=spf1 include:spf.protection.outlook.com -all

Would i add another record, or add to the existing one ?

Thank you,
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Hello Experts,

I am working on a small website that allows users to send a vCard (.vcf file) to an email address they specify. The coding for this function is in php, and I should mention that my php skills are pretty basic. There are 2 versions of the email that sends the vCard: one in English and one in Japanese.
So far, everything is working fine, except that on Android smartphones, the Japanese characters in the subject line of the email get mangled (the body text is fine). It is obviously a character encoding issue.
Researching the issue on google indicates that I need to specify the character encoding for the subject text (in the case of Japanese, I think this would be UTF-8). I have tried a number of things to achieve this, but just cannot get it to work.
I provide the code as an attached file. I’d greatly appreciate it if anyone could have a look at this and let me know of any suggestions for a solution to this. Thank you in advance for any help.
qr-send.php
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Hi All,

Can anyone here please let me know what do I need to do in order to successfully cutting over the Anti Spam solution from onPremise Linux VM into the Cloud Solution with no data loss or user email flow interruptions?

As at the moment on my Exchange 2013, the Send Connector Smarthosts listing the local IP address for the 2x Linux VMs.

Do I just change it to the Public IP address of the Cloud Anti-Spam provider ?

Note: My Public DNS server is running on my On-premise Windows Server 2008 R2 VMs.

Thanks,
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Dear Wizards, when I changed my display name in OWA - Exchange 2016 ono-premises, this error appeared. Can you please explain and suggest? Many thanks.

Env: Exchange 2016 - Win server 2012R2
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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?
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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 :-)
Undeliverable-2018-IAGTO-Conventions.msg
Undeliverable-Time-to-Register-for-A.msg
Undeliverable-Time-to-Register-for-N.msg
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People,

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

Open in new window


But I need further detailed steps if any.

Thanks,
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Dear Experts, I am wondering if we can monitor the usage of users' mailboxes in Exchange 2016 Server (Win2012R2), just like we usually monitor servers, network devices,...; so that we can have proper actions when someone nearly reach his/her quota.

Do you know any tool or procedures to do that? Many thanks in advance
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People,

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
Payments@Domain.com
mail.domain.com
Remote Server returned '<mail.domain.com #5.7.1 smtp; 554 5.7.1 Error: need authentication from 54.79.78.128>

Open in new window


Any help would be greatly appreciated.

Thanks,
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Dear Experts, can we create a distribution group which contains email accounts from different domains (than the server's domain)? If so, how can we configure it?

Example: Exchange 2016 server for domain abc.com

Can we create a distribution group that includes?
- user1@abc.com
- user2@gmail.com
- user3@xyz.co.uk
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Dear Experts, does anyone know how to monitor the email flows from users (like statistics, how many email per day, per hours each user send/receive,..) in Exchange 2016 environment? (Server 2012R2)

Besides, is there any option so that we can limit that number, to avoid hacker can login to email account and send huge number of spam emails to outside, leading to blacklist our domain?
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Dear guys, is there any public black list like this? we are building our own Exchange server and want a list of black domains; so that we can configure antispam agent on Exchange to block them.
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Dear Experts, can we delete the log files in %ExchangeInstallationPath%\Mailbox\DB ?

We observed and saw that they increases everyday. If we cannot delete them, how can we reduce their size?

Env: Exchange 2016 Mailbox server, Window server 2012 R2
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Anyone know the SMTP authentication for San.RR.com?   I'm also not well versed in Apple Mail client so I may be doing something wrong.  I referenced below but I don't see SMTP authentication... My options are External, Kerberos, NTLM, MD5, and Password.  Also, do I need need a IMAP path prefix ?

https://www.timewarnercable.com/en/support/internet/step-by-step/twc-mail.html
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Dear Team, we are suffering the slow problem of Email Exchange 2016: Send from Exchange server is OK, but receive is slow; which ever have or does not have attachments.

We have Avast installed in Exchange server, everything in default mode, not sure which Exchange part should be added to AV's exclusion.

Is there any other way for tuning or increasing the speed (except increase the bandwitdth, we are in Leased line link: 30 Mb/s International + 50 Mb/s Domestic)?

Many thanks as always!
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Can one add a hyperlink to fields that when clicked not only creates an email but can fill in the other email fields like CC, Subject, and Body?

I have done this in excel, but not sure if the hyperlink format formula editor in crystal reports can handle this.

What I did in excel:

HYPERLINK("mailto:"&$A$1&"?cc="&$A$2&"&subject=TRD INQ: "&B9&"  |  "&E9&"  |  "&F9&"%  |  "&I9&"  |  "&H9&" &body=CUSIP: "&B9&"%0AAmount:%0AAccount:%0ASub Account:%0A%0ADealer: "&Y9,"SEND")

this excel formula handles creating the email and populating the To, CC, Subject, Body.
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I have an enormous problem about my disk quota .
Everyday tons of emails enter my mailboxes
I have a plan to pull all my email to sync in local folder. So my i can freed my corporate email
Are there any tutorial to pull all of my corporate email via Thunderbird ?
POP3 or IMAP kindly accepted

Regards

Romi Nur
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Hi

We have a client who has just had a DKIM domainkey setup for them. Unfortunately some emails are not getting through to the end users (especially if using Mimecast mail servers).

We have been doing some testing and have found that:
Emails that do not have an attached file - it pass the DKIM checks.
If emails have attached documents, they seem to pass OK as well.
If emails have got an attached email that was originally from the sender, it passes OK
If an email has an attached email from a third party (that has originally been changed with DKIM) it fails the DKIM test on our/the recipients servers. This has happened to us and we use exchange online servers.

When it fails it says dkim=fail (body hash did not verify)

They have a valid SPF record also setup and every email through the testing procedure seems to pass on the SPF checks without any failures.

There is no DMARC record setup yet, but as far as I can see this is the next step after we have got DKIM working correctly.

Unfortunately our client who is having this problem quite often forward a lot of emails during their working day so need this resolving.

Any help would be appreciated.
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Dear Guys, please assist this scenario:
- Action: We changeed Email server from Gmail to Exchange 2016 On-premise, so we had to change the domain records in Domain control panel. We changed TXT, MX, @, mail records.

- Problem: After changes, the new Exchange server worked (send/receive emails) normally as expected, however we realized that we could still login to Gmail account, Google Drive and sent emails (but could not receive emails)

So can you please explain?
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Hi,

outlook email alerts not coming. How keep alerts so that when email comes popup comes and also preferably some sound comes?
please advise
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Dear, I tried but could not start this service. Does anyone get this error before? Can you please help?
Many thanks in advance,
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After reboot, I got this error in Exchange Management Console, also I could not login to OWA, it showed blank page when I entered correct username/password.

All Exchange services are running. Environment: Exchange 2016, Window Server 2012R2

Can anyone help, please?
err2.PNG
err.PNG
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Email Protocols

13K

Solutions

16K

Contributors

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.