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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My brother-in-law has forwarded an email conversation to me that was initiated by a request for the payment of an invoice that did not exist. The spam email appears to have come from his email address and was sent to people in his address book. I was wondering if someone could help me to recognise whether the spam email is a spoof or whether someone or something has managed to hack into the email account. I have no real experience of reading email headers so please be gentle.
Thank you in advance.
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I set a new IMAP configuration through Outlook 2013 for one of my clients. He originally had a POP3 setup.

My client stated he was wasting allot of time updating his desktop Outlook after he made changes (read, delete, send, etc.) on his iphone, hence the move to IMAP.  

The transition was not easy! He had massive custom folders (including sub folders) under his inbox containing client emails over the years. He is basically keeping a history via his outlook. I ran into a ton of problems attempting to restore a PST backup to an OST IMAP account - too long to explain. At a certain point I was moving one folder at a time/counting emails. I finally got to the finish line. All the folders/emails were synced to the online email server.  As I'm about to report the great news, my client tells me he opened a suspicious word document which turned out to contain a virus.

So...I had to buy new drives , and perform a full restore of  recent backed up images. I bring the system back on line, it performs an outlook sync and proceeds to freeze up the on-line email server web account (purchased through a 3rd party vendor). I am now unable to access any folders, or emails either through the web interface (to a 3rd party email server) or through Outlook. I called up the 3rd party, who stated they will refresh their server. I await the results.

In hind sight, I feel like I should have kept those custom folders out of the sync process. At this point, it feels like a total mess.

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Dear Experts

We have configure CRM application system running on windows server R2, configure the application for outbound and inbound in the email settings section of application  but mails are not getting delivered from CRM system to SMTP server , log report attached, from the OS level when done telnet able to communicate to the mail server, can you please suggest where we might be going wrong and help us to fix this.
email-issue.txt
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I am setting up my organization's email (with Office 365 and an onsite Exchange 2016 server) in a hybrid environment.

Exchange 2016 has been successfully installed and activated on a Server 2016 Hyper-V virtual server.

Now what steps do I need to follow to integrate this onsite Exchange server with Office 365?
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This is unbelievable. An email account or two from one of my customers got hacked. As a result they got blacklisted by... actually GoDaddy (that is who their email accounts are with). So all 65 of these email accounts started bouncing when they sent emails. Now the insane part. GoDaddy says that can't tell which email accounts got hacked (that is lie number 1). Then they want us to:

1) Put up a web site simply because according to the agreement they can't use email without having a web page
2) Change all 65 email passwords
3) Find the first, the very first bounce message someone got. Yes, out of 10 locations and 65 emails then need the very first bounce message received.

   #1 is simple, #2 is annoying but how in the world are we supposed to find the very first bounce message out of 65 email addresses? GoDaddy is a bunch of morons. Even their "advanced team" has no clue how to find the very first bounce message but without it they can't turn the email back on. Anyone have any idea on how to find this one, first bounce message?

Morons. Just a bunch of bleeding Morons.....
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Hi,  Iam creating workflows in Jira and I want as port of the flow to send an Email to the operation team once any change has been planned. But I want it to use various field and free text boxes to guide the user in creating the email.

So my idea is that when the use hits "ready to implement) a form pops up with various fields pre filled such as requestor name and date / time of change) and other boxes free texdt or drop down. then once thes user fills in the form and clicks submit Jira created the email and send it to a pre defiend email.

Is this possible to create email body on the fly based on a pop up form?

Thank you
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I have a client using IMAP in Outlook. Yesterday she wasn't receiving any emails. I looked at the account settings, and they were all correct. I tested the connection, and the test message went through just fine. Then I closed the windows. After a second or two, her emails started coming in. This morning, she again was receiving no emails. I checked the settings again and again tested the connection, then closed the window. Again, after a moment or two she started receiving emails. She never has a problems receiving emails on her phone (also IMAP). It's like every day I have to remind Outlook it can find the server by testing the connection. This is very inconvenient. What can I do?
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I'm configuring postifx mail server in centos 7. i have facing problem related rate limit outgoing mails. my requirement is 3 mail every 1m. so what type of configuration in main.cf and master.cf. i hope you will help me.

Thank you
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I have a website on an internal domain. It's hosted on IIS and uses some javascript scripts and SKEL for for content generation, resizing, it works well as a responsive web page.
There is a form to send email, it is centered around using an external email provider. I have set it up so that it puts the requested data, (type of info requested, name, email, etc) and puts that where it belongs in the users own default email client. (generally Outlook). We have our own SMTP server.
My question is what is the simplest approach to get email sent using the form? The server is Windows server 2016, IIS. I have looked up stuff and see PHP, ASP it's kind of crazy how complicated it gets. Maybe I have not found the right tutorial.
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Hi,

I was trying to send emails through powershell on a computer PC01. and received error message blow
"InvalidOperation: (System.Net.Mail.SmtpClient:SmtpClient) [Send-MailMessage], SmtpException"

I also tried to run the same script on another computer PC02 in the same subnet. it worked.

Both PCs can telnet to the smtp server on 25 successfully.

I have also tried to use ISP smtp to send email which was the same result PC01 didn't work with the same error. PC02 worked.
I checked the even log, no outstanding errors or warnings found.
I have also tried to turned off firewall and antivirus program without luck (which shouldn't be the issue as I can telnet to port 25 on the smtp server)
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Hi

I created the 3 transport rules on the on-premise Exchange mentioned in this article:

https://technet.microsoft.com/en-us/library/jj837173(v=exchg.150).aspx

These rules are not applying, in a test message I verified that the mentioned header
X-Forefront-Antispam-Report is populated:

CIP:40.92.65.88;IPV:NLI;CTRY:US;EFV:NLI;SFV:SPM;SFS:(8156002)(2980300002)(438002)(199004)(189003)(5000100001)(1096003)(102836004)(26005)(33656002)(19627405001)(7636002)(83332001)(356003)(104016004)(6436002)(61614004)(99286004)(106466001)(87572001)(16003)(450100002)(246002)(74316002)(53376002)(54896002)(9686003)(86362001)(16297215004)(2900100001)(55016002)(336012)(6306002)(25786009)(6506007)(82202002)(86152003)(8676002)(7696005)(53336002)(106002)(62560400003)(73972006)(486006)(236005)(606006)(126002)(110136005)(476003)(16586007)(14454004)(5660300001)(7116003)(2160300002)(5250100002)(966005)(2501003)(84326002)(59010400001);DIR:INB;SFP:;SCL:5;SRVR:AM3PR06MB0964;H:EUR01-HE1-obe.outbound.protection.outlook.com;FPR:;SPF:Pass;LANG:de;PTR:mail-oln040092065088.outbound.protection.outlook.com;A:1;MX:1;CAT:PHSH;

The header contains "SFV:SPM" so the first rule should be applying... I checked the message tracking log for the test message but it just delivers...

I enabled pipeline tracing on the on-premise transport hubs but no rule tracking files are created (even though a different rule was applied).

Any ideas?
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Hi,
I have an email server Mail Deamon from Alt-N and once in a while (quite often) my users receives email where the attachment is trucken. Let say the initial pdf was 10mb and my user receives an almost empty pdf of juste a couple of bytes.
I am an Exchange admin and don't know much about Deamon: so where would I start?
tx!
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We have a single user who is unable to send email outside of our organization due to multiple kickbacks with following NDR
Remote Server returned '550 5.7.501 Service unavailable. Banned Sender
I have verified by searching the various online spam lists ( spamhaus, etc) that our domain is not on any list and the issue does not seem to be effecting any of our other users. This user had his account hacked last week and we discovered it was used to send a large amount of spam before we reset his account.
I am unable to find a solution to resolve kickbacks for a single email address.
Help!
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We have been struggling with setting up our website on a GoDaddy Virtual Private Server. Please Help!

We have a .net program that connects to First Data to process credit cards. It running on a Windows 2012R2 + Plesk Virtual Private Server hosted at GoDaddy.We need to send confirmation emails from the server after a transaction is processed. I am attempting to send an SMTP email on a GoDaddy Plesk VPS and am having difficulty with the syntax.  Here are examples of what has been tried with the corresponding error messages.

may-2-email-tests.txt
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email that I'm sending is now going to my customers spam boxes.  kinda happened out of the blue.  its not bulk emails.  its individual emails the i type with info for my clients.  i do copy/paste some info that goes into each email as well.

been working fine for years...its just all of the sudden everyone is saying that email is going to their junk boxes.  

its my own private domain email, i use gmail as the client for checking and sending it.

i havent changed anything on my end.  what do I need to look for to see what is going on?  TIA
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as many others I have also problem #550 4.4.7 QUEUE.Expired; message expired ##
Exchange 2010 works fine for years, suddenly is refuse to send mails to some e-mail addresses.

I checked, MXtoolbox
reversed dns (PTR) is set
in exchange send connector FQDN is filled in and is the same as the PTR


please advice,

Many thanks Victor
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Hi,

I have a strange Problem. I am not getting some emails from some recipient, the TXT emails are delivered without any problem but with PDF attached emails are not passing through.
Even Message tracking it not showing but in SMTP receive logs its showing delivered


____________________________________________________________________________________________________________________________________________________________________________________
XPROXYFROM SID=08D57BA5EA83526F IP=88.99.86.106 PORT=47904 DOMAIN=mail.merint.com SEQNUM=1 PERMS=1073 AUTHSRC=Anonymous,
8847,>,250 XProxyFrom accepted,
8847,<,MAIL FROM:<manivel.arumugam@merint.com> SIZE=0 AUTH=<>,
8847,*,SMTPSubmit SMTPSubmitForMLS SMTPAcceptAnyRecipient SMTPAcceptAuthenticationFlag SMTPAcceptAnySender SMTPAcceptAuthoritativeDomainSender BypassMessageSizeLimit SMTPSendEXCH50 SMTPAcceptEXCH50 AcceptRoutingHeaders AcceptForestHeaders AcceptOrganizationHeaders SendRoutingHeaders SendForestHeaders SendOrganizationHeaders SendAs SMTPSendXShadow SMTPAcceptXShadow SMTPAcceptXProxyFrom SMTPAcceptXSessionParams SMTPAcceptXMessageContextADRecipientCache SMTPAcceptXMessageContextExtendedProperties SMTPAcceptXMessageContextFastIndex SMTPAcceptXAttr SMTPAcceptXSysProbe,Set Session Permissions
2018-03-04T13:01:48.037Z,GSEXCHMC1\Default GSEXCHMC1,08D57BA60716263A,263,[2002:c864:6406::c864:6406]:2525,[2002:c864:6406::c864:6406]:8847,*,08D57BA60716263A;2018-03-04T12:54:14.609Z;12,receiving message
<,RCPT …
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Hi,

So we are working to configure Mandatory TLS security between 2 email domains. We have control of one, which we need to get this configured for.

They are currently using Office365 which routes through Mimecast for email filtering etc.

So my understanding of it is that we configure this on Mimecast only for incoming and outgoing mailflow, however, I am struggling to see how it works correctly, when it needs an SSL certificate from Office365 in order to work correctly?

Do we also need to configure inbound and outbound connectors for this TLS requirement on Office365?

Thanks

Craig
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I am  writing send-mail program in android. it is working OK.
but in case, if we have problem in connecting smtp server or it might bounce back for some other reason..
(My question here  is )
if the sent mail is bounced back for some reason, how to judge inside the android code for the smtp errors and retry sending it later...
several times or for specified tries till it reaches the receiver..
Can any  one  share the code for  queuing emails.. and handling smttp errors. etc.
Thanks in advance
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I have a c# program I am working in that I did not originally create.  I need to add an email element that will create a PDF with graphics (like the attached) authenticate with an email server (like gmail, microsoft or similar) and send that email to a specified address.

I am not sure where to begin, especially on creating the data based graphic.

Thanks.
weeklyemailpdf.jpg
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My ex boyfriend hacked me and deleted/or changed my Gmail  account how can I get it back?
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Is there an easy was to set up email (other than standard received notice) to determine if an email sent has been received. We keep having issues with our emails not received.
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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?
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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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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?
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Email Protocols

14K

Solutions

17K

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.