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.

Filter by
Sorted by
Tagged with
0 votes
0 answers
7 views

Dovecot Mail-Crypt plugin using users password from userdb

I've been looking into encrypting the emails on my Dovecot server to provide actual secure storage of emails (Based of users passwords, naturally). Problem is that it seems that even though Dovecot ...
user avatar
  • 1
-3 votes
0 answers
38 views

What's required to let a domain send outbound emails from multiple domains? [closed]

Let's say I have: 40 outbound emails to send main domain - main_domain.com 4 separate domains-workers with Postfix - mail.my_postfix1.com...mail.my_postfix4.com Goal: send 10 emails via each of 4 ...
user avatar
0 votes
1 answer
37 views

Receive mail from Paypal only to paypal@domain.com

My postfix server accepts emails for 11 domains. I have paypal@xxxxxx.com email accounts on 2 of those domains. I would like to only have Paypal be able to send me emails to these accounts. So if joe@...
user avatar
0 votes
0 answers
14 views

How to test the built in spamassassin auto update feature on Ubuntu server 20.02

I am running an Ubuntu 20.04 based LEMP server, and I have properly set up an email system and added spamassassin to it. Prior to this post, spamassassin was sending me the following email ...
user avatar
  • 93
-1 votes
0 answers
30 views

POSTFIX only sends mail to GMail

I have created a mail server using dovecot and postfix(Ubuntu ec2-aws). I'm receiving emails from any domain. but I can only send emails to gmail. When i try to send email to other domains, CA58541898 ...
user avatar
0 votes
0 answers
9 views

I've set sendmail_path in PHP.ini, and it works fine on the command line, but not when the same script is called from an Apache server?

So I'm trying to do a simple test of some email functions in a PHP (Magento) application, but I'm running into an issue. All I want to do is to store the output from calls to the built-in mail() ...
user avatar
-1 votes
2 answers
29 views

installing SSL on 2 exchange servers

I have 2 exchange servers run for one email service, and I need to renew the SSL certificate. Do I need to issue 2 SSL, or one is enough? If one is enough how can I replicate it between them?
user avatar
0 votes
0 answers
35 views

Postfix: Multiple email address to the same user causing duplicate message

I have setup Postfix on my Ubuntu server to receive and send emails, and then I have created three virtual email addresses via /etc/postfix/virtual like this: support@domain.com mailer sales.support@...
user avatar
0 votes
1 answer
34 views

Postfix bar authentication from internet

I have a Postfix e-mail server which should allow internal users to send and receive mail via it. The sending should happen only when a user succeeds in a VPN connection which provides him/her with ...
user avatar
  • 121
-1 votes
1 answer
30 views

How Does Email Forwarding Works In Customer Support Ticketing Systems?

When you sign up for customer support ticketing systems like Zendesk they provide you with a unique email address something like support@mygoodshop.zendesk.com where you can forward emails from ...
user avatar
0 votes
0 answers
22 views

Configure host base Postfix and send emails using a container

I have installed and configured the nano /etc/postfix/main.cf file for postfix in the host server and when I try to send it from the host server echo "Test Postfix Gmail SMTP Relay" | mail -...
user avatar
0 votes
0 answers
63 views

How to configure EXIM to check SPF record for incoming emails and add 'Received SPF' header to the incoming emails?

I'm playing with Exim and created a mail server that can accept and send emails alright. Now, I want to enable SPF checking for every incoming email so that a Received SPF header is added to these ...
user avatar
0 votes
1 answer
26 views

Warning Message after Postmap Header_Checks with Postfix

I'm using postfix-pcre on my Ubuntu Server. If I test my header_checks configuration with the following command postmap -q 'To: "Markus Schlei" <yylyclw@test.de>' regexp:/etc/postfix/...
user avatar
0 votes
1 answer
73 views

Postfix Recipient address rejected: Access denied error after removing permit_mynetworks

I have a mail server which have to remove "permit_mynetworks" from Postfix configuration file(main.cf) in case of abuse. I only set it to allow SASL autheniented relay. But now, postfix ...
user avatar
0 votes
0 answers
19 views

SSL not fully trusted on ports 993 and 587 of our mail server by Zendesk

We have our own mail server running using iRedMail on Apache. It's been working for us for a number of years and there haven't been any issues with the SSL until now. One of our clients is trying to ...
user avatar
0 votes
0 answers
18 views

gmail smtp vs sendmail configuration in windows and centos

I've got a local server (Windows 10) with XAMPP on it, and for testing Centos 7 with cPanel/SSH access where a Laravel application is hosted. In both cases mail host is set as 'smtp.gmail.com'. When I'...
user avatar
1 vote
1 answer
58 views

How do I tell Dovecot to use another server for SMTP?

I am a bit lost on mail servers, but I have to install a mail proxy (Proxmox Mail Gateway) in front of the actual mail server (ISPConfig, Roundcube, Dovecot, Postfix). On receiving emails, it uses the ...
user avatar
  • 11
0 votes
1 answer
35 views

Personal Proxy for Postfix SMTP?

I have my own Postfix instance running on my server to send and receive letters. It is configured to reject connections from "unknown" hosts. It's okay and I would not change this to keep a ...
user avatar
0 votes
0 answers
24 views

Error on postfix: Temporary lookup failure

I have an error with my postfix installation. Here is the error: NOQUEUE: reject: RCPT from sender11-of-o52.zoho.eu[31.186.226.238]: 451 4.3.0 <othertest@nonexample.net>: Temporary lookup ...
user avatar
0 votes
0 answers
26 views

Box email - subset of domains have stopped working

I am hosting a Box instance on a Bytemark server. I host twenty or so email domains there (for my business and family) and have been for five plus years. Yesterday, two of the domains have been ...
user avatar
  • 185
0 votes
0 answers
25 views

Why would a receiving mail server check the DNS A record of the from domain against a blacklist?

Most (all?) of the DigitalOcean network is currently listed on UCEPROTECT Level 3 (again). I know that UCEPROTECT Level 3 is widely regarded as shady and I personally recommend to our clients that ...
user avatar
0 votes
0 answers
10 views

mail from google computer engine not working, email defer delivery

mail from cPanel installed google computer engine not working, email defer delivery error 220-appsunshine.cprapid.com ESMTP Exim 4.94.2 #2 Tue, 08 Mar 2022 21:27:17 +1000 220-We do not authorize the ...
user avatar
4 votes
3 answers
409 views

Configuring a PTR record in domains.google for an SMTP server

I've found several threads related to this, but they are all very dated so I want to get some clarification. I use an AWS ec2 instance with an elastic-ip, I've set up an SMTP (sendonly) mail-server ...
user avatar
  • 45
0 votes
1 answer
43 views

Procmail not bouncing emails

I have a catch-all email address for my domain, however I want to block certain addresses from receiving mail. Before, I was doing it like this: :0 * ^(X-Original-To): username@example.com /dev/null ...
user avatar
  • 639
0 votes
0 answers
20 views

Email forwarding from exim on debian

Do it looks like Debian (10) out of the box comes with exim? mini31 # apt list --installed | grep exim WARNING: apt does not have a stable CLI interface. Use with caution in scripts. exim4-base/...
user avatar
1 vote
3 answers
58 views

Meaning of "sender"?

Reading documentation about SPF records, I can't quite seem to disambiguate the meaning of "sender". It could mean "the IP where the mail client sent the message" or it could mean &...
user avatar
0 votes
0 answers
20 views

Reject messages containing an attachment with particular file size and extension on Postfix

How to reject or add spam score for incoming messages containing an attachment with particular file size and extension on Postfix or using SpamAssassin / Amavis. For example blocking .xls file with ...
user avatar
  • 171
0 votes
0 answers
46 views

Error setting up SMTP via Exim4

I just started at my current role and I'm the only IT guy... I have a server that is used to send emails to a local smarthost but they just switched to using Office 365 and it "never worked" ...
user avatar
0 votes
0 answers
23 views

Email forwarding resulting in SPAM and bad headers

How can I circumvent spam errors when using a mail forwarder in cPanel? I have a domain which I have configured an email forwarder to forward all emails sent to me@mydomain.com -> me@gmail.com so ...
user avatar
0 votes
2 answers
197 views

Enable SMTP Port 587 instead of Port 25

Through my Office365 subscription, I have an SMTP relay, ‘contoso-com.mail.outlook.com’. Currently this only accepts traffic on port 25 I want to look at setting up port 587 with TLS encryption, but ...
user avatar
0 votes
1 answer
28 views

Spam mail from unknown gmail address

My organization have our own exchange server for mail communications. Recently someone from outside creates gmail accounts in the name of our employees and sending unwanted communications to our ...
user avatar
0 votes
0 answers
22 views

How to enable SSL port 465 on ISPMail based docker mailserver

For local testing purpose I am using this ISPMail based docker-mailserver, which is easy to setup and provides web client as well. But I have a requirement where I wanted to test a Java project with ...
user avatar
1 vote
1 answer
47 views

email validation: is there any point doing both SPF *and* reverse DNS tests?

For a receiving MTA, it seems to be unnecessary to check both the SPF record for an incoming SMTP connection, and to do an rDNS/PTR lookup. Consider: Server gets SMTP connection from aaa.bbb.ccc.ddd, ...
user avatar
  • 35
0 votes
1 answer
152 views

Postfix with only STARTTLS or TLS

I have set up my Postfix to require STARTTLS, or SSL/TLS, as well as the user being authenticated if sending to other domains, or the recipient being known to my host if receiving mail. I can connect ...
user avatar
-1 votes
2 answers
70 views

Prevent spoofing - SPF, DKIM, DMARC in place

I am just a developer handling this issue for our small organization, so apologies in advance if I have missed anything obvious. We use Rackspace Cloud as our email provider. Our emails started going ...
user avatar
  • 99
0 votes
2 answers
109 views

Exchange 2019 Email Address Policy per user

We have been tasked with changing our company domain for email. Active Directory will remain the same. I have created (but not applied) a new Email Address Policy that specifies the new domain. The ...
user avatar
  • 215
0 votes
0 answers
44 views

Postfix spoofed messages using an alias which forwards emails back to the sending domain

My Postfix installation has the following alias configured which will distribute incoming emails to the following addressees : alias@my_domain.com - goes to - me@my_domain.com alias@my_domain.com - ...
user avatar
  • 4,927
0 votes
1 answer
16 views

Postfix Rate limiting according to a particular user

So this question is again on the table. I have tried to get my answer from forums documents but I wasn't able to find the desired answer. So, Here is my question I have created a mail server with ...
user avatar
  • 63
0 votes
2 answers
43 views

Is it possible to send mails via Postfix on another machine in the same LAN without having to relay it?

I thought this was a quite common situation, but I'm struggling a bit getting this to work in the easiest way possible, and also, I'm not sure if I'm doing it in a good/recommended way by now. I have ...
user avatar
0 votes
0 answers
26 views

Associating an outgoing IP address with an authorized user

I have a task to implement sending messages by authorized users through some of their IP addresses. In other words: +-------------+ user1 -> |outgoing IP 1| user2 -> |outgoing IP 2| -&...
user avatar
  • 25
0 votes
0 answers
431 views

Mailcow SSL not working

Using Apache/mailcow I’m setting up a home email server. I followed the mailcow dockerized tutorial. And was able to connect to my mailcow site at: http://mail.example.com:8080 I had to use 8080, ...
user avatar
0 votes
1 answer
110 views

Roundcube webmail on Debian 11 bullseye - Could not save password

first question here, take me slow. I have installed dovecot, postfix and Roundcube webmail in a VM to test a new mail server for the company I work for. All good until I try changing a password as a ...
user avatar
  • 1
0 votes
0 answers
40 views

SSMTP: Map local user (UID greater than 1000) to an external email address

I've configured SSMTP to send system messages for users with a UID < 1000 in /etc/ssmtp/ssmtp.conf: root=to@mydomain.com rewriteDomain=mydomain.com If I send an email to root (echo test | sendmail ...
user avatar
  • 4,927
0 votes
1 answer
55 views

Can't send or receive mails when connected to OpenVPN server (on which also the mail server is running)

I'm a bit stuck here at the moment and will appreciate every push towards the right direction to solve this issue. My two goals are to get an OpenVPN server running on a remote VM (Digital Ocean ...
user avatar
0 votes
1 answer
40 views

Is port 25 enough for running a mail server?

A simple question, is it enough to open port 25 to internet for running a mail server that only send and recieves email, and don't have any external "clients" (imap,pop3)? (all clients are ...
user avatar
0 votes
0 answers
19 views

Postfix owner mail loop 'owner-owner-owner-owner-owner-owner-owner...'

Our postfix logs are being filled with messages that appear to be stuck in the mail queue. I believe this may have been caused by a recent DNS outage. The offending mail was originally intended for ...
user avatar
0 votes
0 answers
17 views

Subdomain & Emailing Hosting

I have a Domain A.Com Which is using Zoho for my emails Now I want to have B.A.Com (B is subdomain, so emails will be Test@B.A.Com) I dont know how to setup DNS for my subdomain. What I did so far.... ...
user avatar
  • 1
0 votes
2 answers
66 views

WebApp needs to send emails via Outlook.com mail account

I have a web app running on a shared server account for the domain example.com. The web app needs to send the occasional email to the app adminstrator. The domain example.com is using Outlook.com as ...
user avatar
-2 votes
1 answer
26 views

Separate eMail relay: DNS requirements beyond PTR record?

Some cloud business offers "always-free" VM instances. Not quite big, but enough for me, so I’m going to migrate my infrastructure there, including mail.example.com. That machine handles ...
user avatar
-1 votes
1 answer
31 views

Multiple emails for one domain

currently I have google workspace emails account and webmail emails accounts on the same domain. The challenge am having is only google workspace emails can send/receive emails but webmails emails can ...
user avatar

1
2 3 4 5
59