I'm trying to create an application that sends an email to an smtp-server.
The server is not set fixed, but will be looked up according to the domainpart of the email-address where the email should be sent to.
Example:
Email To: test#stackoverflow.com
Domain-Part: stackoverflow.com
Result of a MX-Record Lookup (commandline "nslookup -type=mx stackoverflow.com":
stackoverflow.com MX preference = 30, mail exchanger = stackoverflow.com.s9b1.psmtp.com
stackoverflow.com MX preference = 40, mail exchanger = stackoverflow.com.s9b2.psmtp.com
stackoverflow.com MX preference = 10, mail exchanger = stackoverflow.com.s9a1.psmtp.com
stackoverflow.com MX preference = 20, mail exchanger = stackoverflow.com.s9a2.psmtp.com
It would be quite useful, to know if the message was accepted by the mailserver and the message was successfully sent.
What I am able so far is, that I can get the SMTP-Server error code (if there was an error (StatusCode 5xx) by using the System.Net.Mail.SMTPClient Object and its SendAsync Function. There, if there was an error, I get an Exception-Object in the Callback-Event of the SMTPClient
I'm well aware that not every mailserver will tell me if the mailaccount truly exists and then reject my mail with an errorcode but instead just accept the message and then delete it. Therefore I would be grateful for another Method to check if the mail was sent (note: not read, that would be the read confirmation)
The final purpose would be:
Try to send an email to a recipient using it's domains mailserver and if it fails, proceed according to the errorcode (user does not exist -> abort / mailserver did not respond -> use another mailserver if available).
Thanks in advance (and sorry for typos :))
Unfortunately what you are looking for does not exist. Email jumps through so many hops that there is no definition of what "sent" actually means. For instance, your example of stackoverflow actually points to Postini's email servers. Postini probably passes the email around from gateways to AV's and routers. From there they either pool email or pass them on to another email server.
With email, the closest definition of "sent" is "at least I didn't get an error".
Also, a minor thing, but when using nslookup remember to add a trailing period to the domain, otherwise the domain search list is used. Generally not a big deal but every once in a while it might trip you up.
nslookup -type=mx stackoverflow.com.
Related
Hi everyone and thanks in advance for taking the time reading my question.
I have this scenario: I'm using EAGetMail DLL to retrieve emails from a POP3 e-mail server. I have used an example given on the website and so far so good; I can get all the emails from my inbox.
My problem arises when I try to use the data filters that the DLL provides, in order to not get all the emails in the inbox, just a few, using a certain data range.
The code that I'm using for this purpose is the following:
Dim oClient As New MailClient("TryIt")
oClient.Connect(oServer)
Dim options As GetMailInfosOptionType
options = options Or GetMailInfosOptionType.DateRange
options = options Or GetMailInfosOptionType.OrderByDateTime
oClient.GetMailInfosParam.Reset()
oClient.GetMailInfosParam.GetMailInfosOptions = options
oClient.GetMailInfosParam.DateRange.SINCE = System.DateTime.Now.AddDays(-4)
oClient.GetMailInfosParam.DateRange.BEFORE = System.DateTime.Now.AddDays(1)
Theoretically this should retrieve only the emails within last four days from today, but it is not working. Everytime I execute the code I get every e-mail from my inbox.
Has someone faced something similar to this?
The first sentence on this page, regarding the MailClient.GetMailInfosParam property, says that POP3 is not supported:
Search email on IMAP4 Server and MS Exchange Server. It doesn't
support POP3 protocol.
I'm using plus-addressing on Exim to create an automated system - I will process emails based on the local part of the address. So eg:
From: me#eximdomain.com
To: robot+project-4#eximdomain.com
This works well - I can process it based on the To address (specifically project-4). But ideally I want to be able to BCC an email to this address, eg:
From: me#eximdomain.com
To: somebody#otherdomain.com
Bcc: robot+project-4#eximdomain.com
When I am checking the mailbox for robot, I see the message, but nowhere in the header is the actual address that got it there, ie robot+project-4#eximdomain.com - so I cannot process it.
Obviously I do not want somebody#otherdomain.com to be aware of this address; but when robot#eximdomain.com receives it, I want to know that it was actually BCCd to robot+project-4#eximdomain.com (in some/any header).
Is there any way to do this?
Figured this out, if anyone comes across this: added this option to my local delivery transport (Dovecot LMTP in my case):
envelope_to_add = true
It then generates an Envelope-to header containing the incoming address.
I have a bit specific problem. One of the websites I am taking care of runs on ASP and obtains form, whose results are e-mailed to specific address.
For this to achieve, JMail component is used. As long as e-mail was sent locally (let say to user#clientserver.com through mailserver mail.clientserver.com), there was no problem and no need for authentication. However I recently got request to add another address to copy(copy#differentserver.com) and that's when problem occurred.
Firstly I tried adding authentication, however same error still occurred, when without:
jmail.Message error '8000ffff'
The message was undeliverable. All servers failed to receive the message
I tried google solutions, temper with some valuables. I am sure user and pass are correct, mail server address also worked when I wasn't try to sent mail with authentication.
Since I prefer PHP, my knowledge and skill with ASP are not of the bests. Have someone experienced something similar and solved it? Or does anyone know some other solution?
The code, which is used for sending mail:
set msg = Server.CreateOBject( "JMail.Message" )
msg.Charset = "windows-1250"
msg.Logging = true
msg.From= "from#mail.com"
msg.FromName= name&" - "&mail
'those should care of smtp auth
msg.MailServerUserName = "smtpuser#localmailserver.com"
msg.MailServerPassword = "smtppass"
'local mail address
msg.AddRecipient "user#localmailserver.com"
'outside mail address
msg.AddRecipient "address#differentmail.com"
msg.Subject = "Some subject"
msg.Body = "Some text"
if not msg.Send( "mail.localmailserver.com" ) then
Response.write "<pre>" & msg.log & "</pre>"
else
'Succesfully sent, redirect
Response.Redirect("mailjob_sent.asp")
end if
So the problem is solved at last. After help with analysis by my colleagues responsible for local mailserver, we found out, the problem was username for SMTP authentification.
I got confused, since it wasn't smtpuser#localmailserver.com (I'm referring to example I made), but
smtpuser#localdomainname.com.
So advice for others with similar problem, try to add testing account(one you are using for authentification) to your e-mail client(i.e. Thunderbird) and once that is allright, you have right credentials. Also try sending mail from that account elsewhere.
my server uses sendmail 8.13.8 for incoming and outgoing.
I get spam destined to undisclosed-recipients - (see below example) i wish to know which address the spammer sent this to as my mailbox uses catch all from several domains...
I aware i can go to a maillog but that file can be very big . Is there way to rewrite Sendmail header name to always show TO instead of always getting undisclosed-recipients or the BCC address the spammer entered? such as his own? i spent a few months searching for results so i thought i would ask, thank you in advance.
From: Micheal Manka [mailto:micheal.manka103#gmail.com]
Sent: Monday, February 03, 2014 11:15 PM
To: undisclosed-recipients:
Subject: Order
Dear Sir/Madam
I would like to purchase Trap Doors r from your shop.What types of them you have
in the size and what would be the prices? What types of payments do you accept?
Looking forward to hear from you soon.
Regards,
Micheal Manka
Sendmail FAQ 3.29 : How can I add a header specifying the actual recipient when having multiple users in a virtual domain go to a single mailbox?
The simple version with one copy per every recipient passes username as $1 to ~catchall/.procmailrc
virtusertable:
#mydomain.com catchall+%1
The more complicate version http://anfi.homeunix.org/sendmail/sharedmailbox.html mentioned at the end of the FAQ entry is available at http://www.jmaimon.com/sendmail/anfi.homeunix.net/sendmail/sharedmailbox.html
I'm reading emails from pop3 server with zend mail component.
What I want is to know who is sent this email and when I try $message->from I see "FirstName LastName" without senders email.
I do print_r($message->getHeaders()) and do not see sender's email in any header from this email.
I thought that senders email is required and always must be set. Anything wrong here?
Is that possible to have email with "from" header with only First/Last name without email?
As per my comment:
if you print_r() a valid from header and the address is in angle brackets, you may only see it by viewing the HTML source, because the angle brackets and email address may be treated as an (albeit unrecognised) HTML tag, by the browser.
However, if anyone encounters this issue in the future (and the email address does not show in the HTML source), it is worth bearing in mind that the sender could have sent an email without a From: address, even though that is technically invalid.
Yes, this is totally possible. There are 2 usually "FROM" addressess with every email. 99% of the time, these are the same values, but they can be different. There is the MAIL FROM address that is used during the SMTP session, that issues the MAIL FROM command. Then, there is the FROM address found in the email message headers (this FROM address is sent during the SMTP DATA command). This is how you can get email spoofing.
Think of it this way (in the snail mail physical world). You can have a FROM address on the outside of an envelope (this would be equiv to the MAIL FROM command). This is supposed to be the person sending the message. You can then have a FROM value that is different on the letter head that is inside the envelope. This would be the FROM value you are seeing in the email headers.
Here is an example of some raw headers without a FROM address
From: "Steve James"
To: "John Doe" <you#yourcompany.com>
Date: Fri, 24 Feb 2012 07:43:40 -0800
Subject: Here is the progress report
....
Hopefully I didn't make that about as clear as mud.
--
Use the following format:
Firstname Lastname <vasya#poupkine.com>