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Questions tagged [smtp-headers]

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

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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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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 service. I configured DKIM and SPF for all subdomains (1…
Andrea Olivato
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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 immediately. Both are built in PHP with MySQL storing…
Phoenix Rising
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Postfix: How to prepend a header only once?

I want to prepend a header with postfix to every outgoing mail from a specific domain. At the moment i use: check_sender_access hash:/etc/postfix/prepend with /etc/postfix/prepend: my.domain PREPEND Header: value this works quite nice, but when i…
allo
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postfix HOLD Recieved non authenticated

i'm wondering if is possibile to put on hold emails that not have authenticated in Recieved header . i've tryed with a simple negate operazione with pcre !/^Received:.*Authenticated*/ HOLD but don't works , nothing is mentioned about negation in…
user147967
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What is the difference between content-language and accept-language headers in Outlook? How/when are these added?

Outlook 2010 | Windows 7 Can someone please elaborate on the difference between the content-language and accept-language email headers? When do these get added by Outlook 2010 and where can I configured these values? Here's an example: From: Mike…
Mike B
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Rewriting from headers in Postfix

I want to configure Postfix to replace the 'From' header in all forwarded/aliased messages with a custom email address, and the 'Reply-To' header with the original sender's address. Is that something that can be done with a simple configuration…
inxilpro
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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: Return-Path:…
Maciej Łoziński
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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. When I analyze the headers at mxtoolbox I'm…
nbucko
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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 gracefully identify themselves. Sendgrid in particular…
Mikhail T.
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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 Spam by Gmail (to other mail services, emails are…
BociucH
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Postfix "header_checks" is insane for me to accomplish

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 header. So header_checks is the attribute…
Ophion
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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 this email is example@company.com. I do not know the…
xysmlx
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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 message with a FROM of the form user@a.com, it should…
Binarus
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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 seems to me it is setup correctly. Both domain names…
Seth
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