Server Fault Stack Exchange
Server Fault Stack Exchange

Questions tagged [smtp-headers]

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

105 questions
0
votes
1 answer

How do I prevent postfix from adding this Reply-To header twice?

I am running a mail server with Postfix, and I have set this line in /etc/postfix/header_checks.pcre: /^To: board@example.org/ PREPEND Reply-To: board@example.org Board@Example.org is a forwarding address. If someone sends an email to…
3x5
  • 121
  • 3
0
votes
1 answer

Mask mail server IP with Postfix header anonymization?

I'm attempting to setup header anonymization on my mail server, running Postfix and Dovecot on Debian. I've setup some regular expressions to prevent certain meta data, like a client’s IP address, from being leaked. My /etc/postfix/header_checks…
St4rb0y
  • 59
  • 7
0
votes
0 answers

Postfix sending from root@server even when From: specified in header, mail not being delivered

I'm writing a bash script that will email an alert when various system resources are used beyond a certain threshold. I've set the script to make the first line of the email body "From: ALERTS alerts@mydomain.com" (and I've made sure the server's…
1337ingDisorder
  • 101
0
votes
0 answers

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 system has detected that this message is likely…
Tobia
  • 1,272
  • 9
  • 41
  • 81
0
votes
1 answer

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. /^From:.*@example.com.*/i PREPEND X-Mailgun-Tag:…
Nikos Klavdianos
  • 11
  • 2
0
votes
1 answer

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): Received: from mail.domain1.com…
Adam
  • 247
  • 3
  • 4
  • 16
0
votes
1 answer

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 I receive the mail, the To: header is missing;…
Rabarberski
  • 263
  • 1
  • 3
  • 9
0
votes
0 answers

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 host), it will relay the email on to the…
cloudtester
  • 1
  • 2
0
votes
1 answer

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 actually need it). When I send this to an invalid…
Zintah
  • 11
  • 2
-1
votes
2 answers

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 created, via SMTP using the dedicated IP address that…
Gabriela Smith
  • 1
  • 1
  • 1
-1
votes
1 answer

email headers do not show normal ip

I am learning about mail servers, since the mail I send is not received by Hotmail. So I'm comparing mail headers from different sources to find out what could be my problem. I now have a very basic question. In the email headers I normally see this…
Wienel
  • 9
-1
votes
1 answer

How do I view headers, and message source in Hotmail

Hotmail changed their interface, and now I can't right click on the message (in list view) and view headers. Also I can't see the page source, besides the clutter within the regular HTML markup. Can anyone tell me: How to get the message headers…
makerofthings7
  • 8,911
  • 34
  • 121
  • 197
-1
votes
2 answers

Exchange2010 has Private Machine Name and IP in outbound SMTP - How to remove?

We have a domain (domain.local) that has IP Addresses in the 10.10.10.* range. In the outbound SMTP server traffic, I see the internal machine name (exchange.domain.local), and the internal ip address (10.10.10.55). The question is, how do you…
user44755
-1
votes
0 answers

Difference between Authentication-Results and X-MS-Exchange-Authentication-Results email headers

I am using Outlook for my company and I got an email from an external domain. I have analyzed the email headers and the email headers have two headers: Authentication-Results X-MS-Exchange-Authentication-Results Can someone help me understand the…
Bharath Naidu Yenumula
  • 1
-2
votes
1 answer

Remove (Postfix) pattern in postfix email header

Due security due diligent, we need to remove the pattern (Postfix) in our email header. Here is an eg: Received: from Simon-Vs-MBCuiPap.local (unknown [118.69.224.5]) (using TLSv1 with cipher DHE-RSA-CAMELLIA256-SHA (256/256 bits)) (No…
Simon V.
  • 1
1 2 3 4 5 6
7