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Questions tagged [smtp-headers]

Email headers such as Received-By: are SMTP headers.

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"From:" e-mail header spoofing - how to verify such mail?

I'm facing a problem of verifying a "From:" message field in e-mail messages, in terms of e-mail spoofing. I am currently using SPF and DKIM to verify the origin and integrity of messages, but as far as I can work out, SPF only validates the…
gds.jerry
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All headers pass, hotmail still marks as spam

Possible Duplicate: Why Does hotmail still reject my emails? So I've been working a long time on fixing the Hotmail issue, but nothing seems to work: Created my SPF records with the microsoft tool Enabled reverse DNS (and checked) Checked MX…
Gijs P
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2 Received from header at IIS SMTP email send via C# application

I am using windows server 2008 r2 and IIS 7.5 normally. I am using IIS 6 smpt server to send emails. Right now when i send email via my C# application i am seeing 2 received from headers. What might be the cause of this ? Displaying both gmail and…
MonsterMMORPG
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What does the email header "X-CAA-SPAM" refer to?

I've got an application that sends out notification emails to users of the application (this is not spam; the information in these emails is solicited and useful, and is also a feature turned off by default and must be enabled by the user). The app…
lotri
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SpamAssassin, Postfix, and Multiple Addresses in From Header

I'm working on a problem that I'm seeing with an email scanning server (MailScanner, Spamassassin, Postfix, etc.), and From header spoofing. Unfortunately, some of the versions of these components are old, so this may be a bug in one or more of…
rickyboone
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Check headers of a sent e-mail (by sendmail)

When I send an e-mail in console, like: echo "Body of the message" | mail -s "Some clever subject" my.address@myisp.com I would like to check the headers of the e-mail once it is sent. They do not show up in /var/log/maillog and when I check the…
zezollo
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dkim verification keeps failing bad signature

My DKIM verification keeps failing, and I can't figure out why. It's signed though, but wrong. When I check domain and selector it turns out as valid, so problem is with signing. Here is a dump of one test…
Aleksandar Pavić
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why can the Sender field not be easily configured?

To clarify this and this explanation for Sender:: In brief, From: in the message indicates the mailbox of whoever wrote the message, Sender: indicates the entity which sent a message on behalf of someone else, and To: and Cc: indicate the…
Thufir
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Can sendmail reject mail with nonexistent From-Header?

I have a sendmail/cyrus installation. Sendmail rejects mails from non existent MAIL FROM:-addresses. This is good. But sendmail does not reject mails from non-existent From:-header-addresses. The mail is then forwarded to cyrus, cyrus makes this…
Teddy
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Why doesn't the "Received: ...by" email header show the port?

I've had a problem recently with spam coming in with an envelope-from consisting of my own address. At first I thought this meant that my password had been compromised, mistakenly thinking that the "with esmtp (Exim 4.87)" in the "by" clause of my…
sootsnoot
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Adding mail header if postfix DNS based RBL (realtime black hole) check fails

I have setup a receiving Postfix mail server. Here i have custom code written that parses the whole mail received by postfix and use the headers, body and attachments separately for different uses. I have currently added SPF and DKIM checks in…
Ashish Sharma
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Minimal Exim router which simply adds custom header

I answered this question with my current solution, but as I said I'm not 100% happy with it. That solution to the question 'How to add a custom header to all outgoing mail' involved adding the headers_add parameter into the existing Smarthost…
dsl101
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Microsoft Exchange: add **for foouser** to received-line

Some mail servers tell me the envelope recipient in the Received header. In this example the third headers shows needle@vooconto.de. Received: from mail.example.com (..) by visexchange01.vooconto.intern (..) with Microsoft SMTP Server (TLS) id ..; …
guettli
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Checking SMTP headers for spoofed email (did client authenticate?)

I have been using rackspace email service, and I am finding that rogue emails are seemingly coming from harry@mydomain.com to james@mydomain.com but were never actually sent by that user. As per rackspace this email was sent via harry@mydomain.com…
morleyc
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Why does my server hostname appear in Exim email headers sent from a different domain?

I've had several problems with SMTP emails from my server and domain sent using Exim being blocked by certain other domains, which may have been partly due to certain server settings tripping up certain optional strict MessageLabs filters. One of…
user56reinstatemonica8
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