Questions tagged [email-server]

Refers to the hardware or software that make up a server dedicated to sending and receiving emails. Many popular modern email servers bundle other functionality for contacts and calendaring along email delivery.

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18 views

How can I follow one email through the mail.log file?

I hope someone can help me out here. I read through the mail.log file trying to track an email through the full process from being accepted to being delivered. Now this isn't bad if the server is ...
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2answers
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Centos/DigitalOcean - Spam Emails Being Sent From My Server [closed]

I've contacted vBulletin support, digitalocean support and cPanel support to which neither cover support on this, i need help. The email address that sends automated emails or system emails to ...
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rspamD - multiple server setup

i already use rspamd within my mailserver construct. Currently there is only 1 rspamd instance on 1 server. For HA reasons i'd like to change this and add another rspamd server into my mailconstruct. ...
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1answer
44 views

Postfix can send, but not receive external email with configuration in CentOS 8

I have two problems, and I believe they are somewhat related. First, I can receive email from domains in my local server in Roundcube and Horde, but not in Thunderbird or Mac Mail. Secondly, I can't ...
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29 views

SpamAssassin attach report to mail

I've set up a Postfix mail server with SpamAssassin and spamass-milter for SPAM detection. Everyhting so far seems to work well. My mails are getting tagged as SPAM within the subject and are ...
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Ubuntu Postfix rDNS setup

I try to hard found the solutions... https://www.mail-tester.com/ : rDNS failed IP: 91.227.139.178 HELO: webpot.hu rDNS: r139178.rackhost.network Cloudflare PTR PTR r139178.rackhost.network 178.139....
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3answers
58 views

Can I setup an email server to receive emails faster

I'm subscribed to a web service that sends periodic email mailouts. My task is to get these with the lowest possible delivery latency. What can I do to minimize latency? And what is a realistic ...
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Postfix BCC Outgoing Mail with Specific Text In Subject

I have a client who would like to receive a BCC copy of all outgoing emails for their domain(s) that contain a specific text in the subject (eg. Quote, Quotation, etc..). Is this possible in postfix ...
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33 views

Postfix unintentionally rewriting email addresses with virtual domains

I have had a postfix mail server running for some time mostly just taking mail for a couple of personal domains for me. I was recently asked if I could email services for a family member, and I'm ...
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Dovecot quota - infinite loop when mailbox full

We get an infinite loop once quota is exceeded. Having set up the dovecot quota as per https://doc.dovecot.org/configuration_manual/quota/ Here are the parameters I modified (my setup was working with ...
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1answer
46 views

DMARC failure for delivery report

I have a Docker-based mail server (Mailu) setup. It's working great except for delivery reports which are sent automatically (one of the user mailboxes is full and a "Quota exceeded" ...
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1answer
29 views

postfix keep original sender ip on mail server delivery

I have Proxmox Mail Gateway facing internet with port 25. When the email is recieved it is read and then forwarded to mail server. On my mail server i see that all the emails are going from this PGM ...
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Email with CC make single request or multiple request to the mail server

I've set up a mail cow server on the cloud. I'd like to send group emails and all my recipients are on my server itself. So to optimize the server load, one email with many cc is any better than ...
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2answers
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how to determine if I have the latest security update or not by powershell?

I'm a beginner to exchange server and powershell, I'm working on Exchange server (on-premise), how can I determine if I have the latest updates, security update, version of windows server (core) and ...
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1answer
65 views

Postfix tries to lookup external address locally

I am currently trying to set up a mail server using postfix, dovecot, amavis, sqlite, etc.. Lets say I have: mydomain.com and mail.mydomain.com (MX record points here) When sending an email to an ...
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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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Safe to assume emails are getting through if they're not bouncing back?

I am setting up an email server on Debian 11 with Postfix, Dovecot, and Roundcube. I am able to send emails FROM Roundcube to a gmail address I control. When I reply to the email sent from my server ...
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1answer
39 views

Postfix double relay configuration

I have 2 servers with postfix. ServerA with this main.cf: relayhost = smtp.public.com:587 smtp_use_tls=yes smtp_sasl_auth_enable = yes smtp_sasl_password_maps = hash:/etc/postfix/smarthost_passwd ...
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1answer
40 views

Tracking the IP and Physical address of the machine originating an email message

My organization is using Google's email services for the creation and management of their email accounts. Recently, an objectionable email was sent from a Gmail ID (presumably a fake account created ...
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1answer
99 views

Amazon SES - Domain Verification Pending

I am trying to setup Amazon SES on my Route53 domain (writeurl.com). The domain verification status remains at pending verification and does not proceed. The following nslookup command does not show ...
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2answers
45 views

Restrict Email Delete Access in Outlook Using Group Policy

Is there a way to restrict users from deleting email from Outlook using Group Policy or some other setup? Or else is there any email client or provider having functionality such that admin can ...
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0answers
48 views

TLSA lookup error for dhmx02.web.de:25

we are running a mail server and always the same error in the logs (for a specific recipient): Aug 23 05:39:17 Mailer postfix/smtp[13561]: warning: DANE TLSA lookup problem: Host or domain name ...
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32 views

How to route/forward a specific email account from one Email Provider through Microsoft O365 Exchange Servers

My company has around 10 custom domain email accounts that were included our website's hosting plan. Our website sends out at least 300 emails a day in response to customer's requesting quotes for our ...
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1answer
123 views

403 following Modoboa-apache2.4 setup

Machine details: Ubuntu 20.04.3 LTS Apache2 2.4.41 Mariadb 15.1 (don't think it's pertinent) I recently followed a guide to install modoboa (mail server) on a fresh server. The default setup install ...
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1answer
49 views

Postfix blank sender from= <>

Recently I received spam report form my vps provider and Trend Micro, I think my vps got suspended because a or some unknow "blank sender" using my mail server as a "jump point", I ...
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1answer
41 views

Setup an Email server [closed]

I know that the title of this post is not very indicative. But I thought the simpler it was the more people would watch. I am trying to set up a mail server with Ubuntu 20.04. The software I am using ...
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2answers
100 views

Empty Email when using MS365 as a mail relay from a Python application

We've got a very weird issue going on here. Take this example email (raw form, sanitized): To: TestList@example.com From: Thomas Ward via TestList <TestList@example.com> Subject: Test Message ...
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1answer
53 views

Mailbox unavailable. The server response was: 5.7.1 Client does not have permissions to send as this sender

I have an issue where a new mailbox in Exchange Online is reporting Mailbox unavailable. The server response was: 5.7.1 Client does not have permissions to send as this sender when sending mail from ...
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1answer
35 views

After adding a new DNSBL to Sendmail, how can I resubmit an email to see if it will be rejected?

TL;DR How can I fool my own sendmail into thinking an email comes from a particular ip address, so that it rejects the message due to a DNSBL match? Details: I run my own mail server, and most spam is ...
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0answers
114 views

Postfix + Dovecot and folder "sent mail"

We’re using for sending mails our own mail server Postfix + Dovecot with parameter for Postfix sender_bcc_maps which ensures that sent mail thanks to blind copy (BCC) is also sent to a sender’s ...
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1answer
42 views

How to verify if an email was received and read

I accidentally sent an email to a wrong email address. The owner told me that he didn't receive my email because there were no email servers configured for that domain. However when I did MX lookup, I ...
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1answer
155 views

Postfix / Dovecot can't send or receive e-mails in Ubuntu 20

I've generated ssl files using letsencrypt and everything is installed and configed but my IMAP and SMTP are not working. What I can find from the /var/log/mail.log file is this error: dovecot: imap-...
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1answer
203 views

How to setup a Linux LAN local mail? [closed]

I'm looking for instructions on how to create a Linux local mail server for a LAN, in the following way: The Server (Ubuntu) as the SMTP server; The workstations getting their mail (and sending to ...
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3answers
59 views

Does mail dot com have IPV6 MX?

It seems mail dot com does not have an ipv6 smtp server. It is a little weird for such a famous email service provider. Or, I did not find a way to get its ipv6 server? I used the following command to ...
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0answers
48 views

AWS SES Managing and Forwarding Incoming Mail

I'm probably in over my head with this one. Please bare with me while i fumble through my explanation of what it is that i am trying to accomplish here. We own a domain name. Have access to the back ...
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120 views

Authorization failed when I try to log into gmail using fetchmail

After solving a small problem with starting fetchmail I am faced with another obstacle. This time related to accessing a gmail account through "fetchmail" I know it's a lot of stuff but I ...
2
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1answer
30 views

Fetchmail does not use the indicated protocol

I'm trying to setup fetchmail for download some mail from gmail using pop3. The problem, as you can see, is that fetchmail instead of use the pop protocol will use imap. For being sure to not have ...
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1answer
31 views

Clarification on the configuration of a mail server

I would like to start by saying that I have not seen any other forums or posts that clearly explain this thing. If there are, my poor English skills probably didn't make me understand the solution ...
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1answer
117 views

Can an SMTP server tell the sending MTA to send to another address?

Can e-mail forwarding be accomplished with the receiving MTA responding in some way that tells the sending MTA that it should send the e-mail to another address, or must e-mail forwarding be performed ...
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0answers
29 views

Storing complete emails including linked images

In short, I need to store emails in their entirety; not just the headers, text, and HTML, but also any images linked to in the content. I currently have a mail server set up with Postfix and Dovecot. ...
2
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1answer
114 views

Why does my postfix reject mail with a spf hardfail even though spf DNs record is set to softfail?

The log output I get is the following: "Jul 7 11:23:46 mail policyd-spf[19779]: 550 5.7.23 Message rejected due to: SPF fail - not authorized. Please see http://www.openspf.net/Why?s=mfrom;id=...
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1answer
33 views

Balancing with MX records - How does this work?

enter image description hereplease can you help me with this, I have this scenario to balance email traffic, currently, most of the emails are going towards imail2.test.com.pe and imail.test.com.pe ...
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1answer
32 views

Null Client Mail Server

I want to set up a null client mail server, i.e. a mail server that sends e-mails, but does not receive e-mails. I tried multiple guides relying on postfix, checked discussions on this and other sites,...
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70 views

Can't reach the server from domain in local network

First of all I want to create an email server for myself. I did almost everything in here (https://www.linuxbabe.com/mail-server/ubuntu-20-04-iredmail-server-installation) but when I try to set the ...
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179 views

Postfix not receiving external mail and local mail stuck in queue

I have an issue that I can't find solution for. My Postfix server crashed, I re-installed it, but now, and no matter what I do, I can't get it to forward incoming emails to its designated domain. I ...
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1answer
111 views

Unable to send email to gmail account from my mail server

I've created a mail server and have setup a PTR record from the ISP to my static IP server. The mail server works well and am able to send and receive emails and send mails to many email addresses ...
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1answer
26 views

Postfix wrong sender email

Hello my domain is example.com but when i use the mail command it sends the email with root@mail.example.com What did i missconfigure? Command im sending: echo "Test" | mail -s "Test&...
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26 views

Postfix: Delete specific emails

I'm using Postfix as an email relay between a windows app that can't authenticate with gmail and gmail. Every night between 12 and 1am this windows app sends a superfluous email that ideally I'd nuke ...
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1answer
72 views

How to proxy IMAP/POP3 connection to appropriate backend mail server by domain

I have system with multiple email server (exchange, zimbra) for multiple domain. So when users of domain A want connect to server for getting email they have to use IP of server A (Ex: 192.168.10.253),...
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1answer
50 views

How to stop OS/daemon information leakage in dovecot (server_tokens)?

How do I stop dovecot from telling its clients what flavour of linux I'm running and that it's a dovecot imap server? If I connect to my smtp server, I see the following snippet user@host:~$ openssl ...

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