Questions tagged [smtp-headers]

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

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How can I understand if my MX is changing the message envelope?

I have an exim4 server that forwards all input emails to a gmail account. Gmail is refusing some valid messages with this error: SMTP error from remote mail server after end of data: 550-5.7.1 Our ...
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Remove ServerSignature, Labels and Lines from Postfix/Linux Incoming and Outgoing Message Headers

My mail server is on Ubuntu and I use SSH, Plesk and Warden Anti-Spam wiith Amavis to Handle my settings and filters. I'm trying to hide some sensitive data unnecessary and labels from Incoming and ...
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Postfix header_checks add X-Mailgun-Tag

I am trying to add in the postfix header_checks, using PREPEND, some X-Mailgun-Tag headers. When using the following expressions in the header_checks, it applies without issues to all domain emails. /^...
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what addresses are in the first "received:" entry in email header

I am trying to figure out whether an email header contains the IP address of the host who sent the email. The header is supposed to have a number of received: fields, which list that one mail server ...
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How to add List-Unsubscribe header to a single address in postfix?

Just setup a mailserver which I intent to use as both a regular mailserver and also issuing a newsletter to my clients every few months. I want newsletter@example.com to have a List-Unsubscribe header ...
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Mail Enable email headers when sending emails via ASP.NET

I have multiple websites running on my server: domain1.com and domain2.com The problem is now that when I sent an email via ASP.NET from domain2.com, that in this email source I see (notice domain1): ...
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Make Postfix add "Authentication-Results" header to locally originated mail destined to local domain?

If I write via sendmail or SubmissionS client a mail to my virtual account (my domain is example.org), the mail I receive looks like this: Return-Path: <user@example.org> Delivered-To: user@...
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Postfix does not add to: header for outgoing mail

I have configured a basic Postfix setup to send mail using an external smtp relayhost, and resolving locally address mail via /etc/aliases. Sending email works (via the sendmail command) However, when ...
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Handling badly folded long Return-Path header gracefully

I've got a problem with my POP3 provider delivering me e-mails with broken Return-Path header. When it's long, it gets wrongly folded into multiple lines, in the middle of e-mail address like this: ...
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Change From (Sender) address using Postfix as a relay and pass validation

I'm trying to relay mail via Postfix and change the sender address whilst also passing DKIM/DMARC validation. So if I send an email from user1@domainA.com via the Postfix relay (using it as a smart ...
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SMTP Delivery Failure Headers

hoping someone could help me out. I'm sending out SMTP email with a custom header, e.g x-commId and for a successful email, this header is shown in the received message header (Which is not when I ...
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Remove unnecessary quotes from sender display name with special characters

I have set up Postfix with Dovecot and SquirrelMail on an Ubunutu 18.04 machine. Everything is working great, except for the display name with special characters. In SquirrelMail, I have configured ...
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Blank line in email headers causes Postfix to skip remaining lines

I have a daily email that comes in to one user in which the headers of the email contain a blank line. This is causing mail clients/webmail to display "Invalid address" "Unknown date" and no subject. ...
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Transport Rule After Hours Pattern

I am trying to create a Transport rule to automatically add the shared email address when received after hours (8am-5pm). The current idea is to use the "when the message header matches text patterns"...
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How to modify Receive header in Postfix

Each Mail Transport Agent that encounters a message adds a Receive header to indicate where, when, and how the message arrived and also some data about the receiver. When I send an email from Mac Mail....
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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 ...
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Sendmail From address

Any help would be greatly appreciated. I'm trying to use sendmail to send a message with a custom "from" e-mail address. The body of the message is a file, pasted below. What I'm seeing is that ...
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How to make Sendmail add an evelope recipient(s) header to all inbound email messages?

Disclaimer: I have read some of the questions and articles here and elsewhere which deal with Sendmail rewriting headers. I haven't found an answer to the question below because the other question ...
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How to block SendGrid spam with sendmail?

Sendgrid and MailChimp are the two biggest sources of spam captured in my spam-folder. I'd like to block them before they get there. Fortunately, in an effort to appear "legitimate" the spammers ...
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Postfix: SMTP relay authentication for FROM local addresses only

I have Postfix SMTP configured to require authentication for relaying mail to outside world. When an outside SMTP server want to deliver mail to my domain (destination: anything@mydomain.com), ...
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Show Public IP address when sending via Postfix via Postmarkapp

We have a security system set up where the first time a sold computer is booted up we get an e-mail from it's destination to show its been received. The police recommend we do this after a number of ...
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Postfix - proper header settings

I'd like to ask you about setting up a proper header using to sending emails from my server which is running on Ubuntu 14.04 and Postfix is installed. All the emails sent from my server are marked as ...
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Does Email Header record / include the IP address of the Receiver?

In an email header, it seems only the IP addresses of the email sender and also the relaying servers are logged, as it travels to its destination. However, I need to also find the destination IP ...
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exim4 sends wrong Mail From header

When I send an email via my smtp exim4 server, I get this error: The sender address blah@usersdomain@myserver.net is not\n553 5.1.2 a valid RFC-5321 address. Logins to the server are with full email ...
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Postfix "header_checks" is insane for me to accomplish [duplicate]

I'm trying to REJECT an email with a certain phrase in the SUBJECT (e.g. "quota limit") using Postix 2.9.6. Following the postfix's documentation I realized postfix handles this info by checking the ...
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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 ...
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To-Recipient Required in Email?

I would like to know if a "To"-Recipient is required in an e-mail per definition or if all recipients could be Bcc or Cc. RFC5322 states The only required header fields are the origination date ...
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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 ...
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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 ...
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Why does my server hostname appear in SMTP email headers sent from another domain?

I have seen some similar questions here however i am still to find a proper fix to this issue. The issues are as follow: I am trying to send emails from this email@domain2.com email address I ...
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mail header “from” domain is automatically replaced by server's domain, why?

The mail header "from" domain of any mail sent to our company's server is replaced by server's domain. For example: example@gmail.com send an email to our server(company.com). We see the sender of ...
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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 ...
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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 "...
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"Dynamic" HELO with sendmail: Possible?

Suppose there is an instance of Sendmail 8.14.4 which handles incoming and outgoing email messages for domains a.com and b.com. Now, what I'd like to achieve is the following: If Sendmail sends a ...
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10 votes
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Why don't my domain's messages to a google group get their headers rewritten so DMARC can pass?

Whenever my domain sends a message to a google group on another domain the DMARC alignment fails. This is true for all my approved senders, even using Gmail in my domain. It seems to be because the ...
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Why do email headers show the wrong IP address from my Exchange server?

Please help me re-frame question for positive use if needed, thank you I use two domains mail.hpdist.com and mail.hpsteaks.com. I am a little unsure how to properly walk through the testing as it ...
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Number of issues with postfix, DKIM, and mail getting rejected or bulked

I'm having a number of issues with Postfix and mail sent being rejected or put in the spam/junk folder. I am trying to send emails on behalf of a number of my customers. I've got a postfix server set ...
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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 ...
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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....
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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 ...
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Filter emails based on missing header in Postfix

How do I reliably enforce a policy of certain header being present in all messages in Postfix? For example, To: header. I've read about header_checks and used them previously to filter messages ...
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exchange 2013 content-type header

I am creating Transport Rules to create company-wide signatures. One of the quirks that I noticed was that, while everything looks great for HTML mail, anything sent in plain-text includes a bit of ...
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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 ...
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1 answer
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Why is sendmail adding an extra carriage return in headers?

I've got SendMail 8.14.4 running on a CentOS 5 server. A user in Japan is sending a message and when it gets processed by the server, SendMail is adding an extra carriage return for some reason. ...
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How can I dump email headers to plaintext files?

I have a .pst for which I would like to extract header information for all emails and dump it to one file per email. How would I go about doing this?
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2 votes
2 answers
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Postfix header stating wrong IP

I am using Postfix 2.11.3 on Debian 8.0 I configured Postfix to run multiple instances (3), one for each public IP connected to our server in order to balance outgoing traffic depending on the ...
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2 votes
1 answer
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Benign Email Headers

On our server, we have two separate email systems: if it's a long queue of recipients, then we store it in a queue to be sent in a cron. If it's less than X number of recipients, then it sends ...
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1 vote
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Forwarding email with postfix via AWS SES

I have a server with postfix MTA installed that accepts mail for my domain, hereinafter @example.com. I need to setup forwarding for certain emails@example.com to other emails . e.g. @gmail.com and ...
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9 votes
2 answers
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Postfix: selecting relay host based on From: mail header rather than envelope sender

I've successfully set Postfix to relay emails via Mandrill using SASL and sender_dependent_relayhost_maps with a MySQL table so that different senders connect to Mandrill using their own Mandrill ...
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postfix header_checks - regex spanning multiple lines

I would like to create a spam filter that spans multiple lines in headers. This is my /etc/postfix/header_checks file: /^From:.*name[0-9]+@.+[\r\n]+To:.*name@domain\.com/ REJECT It's a valid regex, ...
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