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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HI Folks,

I wonder are there any experts out there that know how to analyse email header source. One of our clients received a bogus email that appeared to come from one of our staff members email address.. it did not. .. unless his email account was compromised.

I've asked the receive to send me the header of that bad email and they did. I put the message header into a Google Product called "Message Header Analyzer" and the results are attached.

My question: from this is there any way to determine the source of the email? Our domain is trinav.com. So did the come directly from us or is it from another source and just looks like from  @trinav.com

Am I making sense here? Any help would sure be appreciated!

Thanks!
Messageheader.png
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An organization I support needs to have a local Exchange 2016 server setup that will integrate with Office 365.

Please provide me with step-by-step instructions on how to do this.
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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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This course will introduce you to the interfaces and features of Microsoft Office 2010 Word, Excel, PowerPoint, Outlook, and Access. You will learn about the features that are shared between all products in the Office suite, as well as the new features that are product specific.

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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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:

*(2)

client:
message
id:
Size:
relay:
delay(s)
status detail
KLMS:
av-reason:
ap-reason:
as-reason:
cf-reason:
action:
rules:



809318:Jul 11 14:13:50 amail-2014 postfix/smtpd[17127]: 78F5E83F28: client=mx0a-00164e02.pphosted.com[67.231.149.89]
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[195.168.126.227]: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: …
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Hi
I got a mail from capgeminioffers.in@capgemini.com was it real or not please tell me
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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
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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
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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.
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Email Protocols

13K

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.