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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11 views

Restrict postfix login to our clients only (e.g our own android/ios app, our own webmail)

I am new in this smtp or something about setting up mail server or client. I want to ask, how to restrict postfix login to our clients only? the reason is i want to use 2FA to login, but seems it's ...
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Rejecting emails based on sender address before queueing Postfix

I have a multi-instance Postfix setup that sends about a million of messages per day. The mail comes from an java app, and sender email address contains id of the app user that is the author of that ...
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Postfix & Dovecot: mail shows up in sent but nothing in inbox

My probelm in short: I Have a local mail server (postfix and dovecot and using self-assigned SSL, openssl) on ubuntu server 18.04, i can login from another pc in same network fine (only get warning ...
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How to resolve “signing key too small” issue from mail-tester

We've recently been having some email delivery issues, so I find myself taking my first dive into the email server set-up world to make sure our emails are arriving as expected. I ran mail-tester a ...
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Server Configuration Error if Receiving e-mails

Another Problem, I have a VPS where I installed a Dovecot, Postfix, PostfixAdmin and Roundcube webmail. I can not receive emails anymore from any external address, I get this Problem: This is the ...
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Postfix: What does “If your machine is a mail server for its entire domain” indicate?

Environment: Postfix 3.3, Centos 8, Digital Ocean Droplet I'm reading the Postfix basic configuration readme and I came across a definition I don't fully understand. Under the heading, What domains ...
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Postfix routinely references both smtp and smtpd in configuration files. What is the difference? [duplicate]

Environment: Postfix 3.3 In my main.cf file I see references to both smtp and smtpd. For example: smtpd security is set here. smtpd_tls_security_level = may And just a few lines below smtp ...
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In the Postfix main.cf file which FQDN is assigned to mydestination?

Environment: Postfix 3.3, Dovecot 2.2, Centos 8, Digital Ocean Droplet Background: Inside /etc/postfix/main.cf is the following directive. mydestination = $myhostname, localhost.$mydomain, localhost ...
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Reject email and force the sender to switch MX records

I am setting up a mail server solution. I want to apply the scenario like this: The domain used is configured with 2 MX records (one with priority 1 - my server and one with 10 - a third party STMP ...
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Connect Cyrus Imap to AD

I am trying to connect Cyrus IMAP to an Active Directory following this instruction. I have set ldap_servers to ldap://myad.domain.com but if I telnet on the Cyrus Server it returns cyrus.domain.com. ...
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Is there a real technical difference between Transactional e-mail and Marketing / Bulk email?

There are a lot of articles about differences between Transactional e-mail and Marketing e-mails (or bulk e-mails). I understand the business difference between these two, but is there any real ...
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Having port 25 closed triggers error on MXtoolbox. Do I need Port 25 open for mail server to function correctly and consistently?

Environment: CentOS, Postfix, Dovecot, Digital Ocean Droplet Background: The mail server I just installed appears to send and receive normally. I tested my website on MXtoolbox and received 1 error ...
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Mail Server with Virus and Spam Protection using CentOS 8

I have been working on building a simple mail server using CentOS 8 as the base linux distribution. However, I've hit a issue where I can't get the virus scanner to work correctly with Postfix. I ...
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OS X Server 10.8 Sending Email

I'm running a 10.8.5 OS X Server box, with mail running. I'm using one of my local email accounts to send email to a hosted address I have. This where it gets tricky. Web is hosted internally. ...
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Can both a web server and email server be referenced in the hosts and hostname files?

Environment: CentOS, Nginx, Postfix/Dovecot, Digital Ocean Droplet Question: Can both a web server and email server be referenced in the hosts and hostname files? Is it better to have a separate ...
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How to add SSL certificates for multiple VPS (Shared Hosting Servers) with the same primary domain?

I am planning 3 VPS shared hosting servers. Of particular focus in this question...they are also acting as mail servers. host1.mydomain.com host2.mydomain.com host3.mydomain.com (where "mydomain" ...
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MTA rejects mail, returns 554 error although rDNS is set

I have a docker-mailserver container running fine except that mails aren't delivered to GMX and web.de which are both german mail providers belonging to the same holding company. I assume they have ...
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Dovecot + Exim = relay not permitted

I have setup a simple mail server with Exim and Dovecot. Since obviously I don't want to have an open relay server, I want to restrict the access from outside. I figured the following configuration: ...
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How to make both the website and dockerized webmail work together on same server

I'm having new VPS machine where: Install nginx on main host to serve my domain website (e.g. example.com) on ports 80,443. example.com conf in host nginx: server { server_name example.com www....
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Exchange/ePrism quarantine settings

I'm temporarily overseeing the company's infrastructure while we find a replacement for someone who recently left. We have on-premise exchange with ePrism (EdgeWave). Most of our users find our email ...
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How can I avoid gmail/att receipt issues for a client who sends over Cox Business Internet?

My client uses Cox Business Internet as their ISP, and is very tied in to using Outlook to access their email. Their webserver and email server are currently hosted on Linode. These may be on the same ...
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How to add a whitelist for senders to omit auth check in Exim mail server

I need to whitelist domains from a list (with wildcards) in Exim's ACL to avoid auth SMTP checking for domains hosted in this server. My server, say Server A, hosts e-mail for coolstore.com domain, ...
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For SPF records do 'a' and 'mx' achieve the same result in many cases?

Example DNS Records: Type: TXT Hostname: example.com Value: returns v=spf1 a ~all Type: A Hostname: mail.example.com Value: 1.1.1.1 Type: AAAA Hostname: mail.example.com Value: 1000:1:1:1:1:1:0001 ...
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Why do I need an A and AAAA record in addition to MX record for my mail server?

Environment: Postfix, Dovecot, CentOS, Digital Ocean droplet DNS Records: Type: A Hostname: mail.example.com Value: 1.1.1.1 Type: AAAA Hostname: mail.example.com Value: 1000:1:1:1:1:1:0001 Type: ...
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Emails go to spam from server A, but form server B not (same configuration)

I have puzzle with my So You Start servers from OVH - from server A my mails go to google spam folder, but from server B it is ok. I'm not sure that it is problem with SOS servers or some IP addresses....
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postfix sena message-id with hostname

I get messages from server as: Message ID <20200429195914.CFB9885FA4@hostname.com> ARC-Authentication-Results: i=1; mx.google.com; And as result in google notification: mailed-by: hostname.com ...
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Domain Reputation - sending Emails through AWS SES

I send emails through AWS SES to increase the chances of my emails being delivered to users. It's been working quite well so far. However, as I send emails through AWS SES, is the Reputation of my ...
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Postfix/CentOS 8 mail for external servers loops back to myself

I have installed a CentOS 8 VM a couple of weeks ago, and since I've bought my domain last week I decided to run a mail server alongside the apache web server and DBs on that machine. After a bit of ...
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80 views

Email/IP Reputation between private email servers

I have a private self-hosted email server. I'm aware that if I send emails to Hotmail/Yahoo/Gmail addresses, and the users Open the emails and Reply to the emails, my Domain & IP Reputation will ...
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Is this configuration for email is secure?

I am using nodemailer package with node.js to sending mails, and I am not sure about security. The host I've received is working only with this configuration (also with port 587): const transporter ...
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dovecot authorization fails when trying to connect via mutt but all suggested dovecot auth tests work

I can't figure out why the dovecot authorization process is dropping the domain from my username name when when attempting to connect through my client (mutt). I'm using the simple auth-password ...
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The DMARC test failed but we didn't find any obvious reason why

One of our users recently found out his emails are going to spam for some reason. This made me dive into everything and the last thing I can't seem to figure out is the Dmarc. We're using gmail for ...
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PostFix What Does “inet_interfaces ” exactly mean?

I'm installing a Postfix Server and some people say that I have to change the inet_interfaces = all to inet_interfaces = loopback-only So now I am wondering, what does inet_interfaces exactly mean (...
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postfix: mail to localhost gets delivered but mail to FQDN bounces “mail for localhost loops back to myself”

My issue is that (on the mail server, which is named mail-test) I can do this: echo "test!" | sendmail ethan@localhost but I can't do: echo "test!" | sendmail ethan@mail-test.[REDACTED DOMAIN] ...
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Inaccessible SMTP server, no error from mailer daemon

I would like to know what behavior should I expect, when I try to send an email to an address where the corresponding server has no working SMTP daemon instance running (for whatever reason). My ...
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49 views

Unable to send outbound emails both internal and external on new installation of Exchange 2016

I have installed a WINDOWS 2016 server and Exchange 2016 without EdgeTransport. This is only windows server in our environment so I created a new forest and new local domain.I have gone through ...
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Why are my Postfix mails recognized as Spam? [duplicate]

I have a Postfix mail that I have configured pretty good. mail-tester.com gives me a 10/10. I have tested on both Google and Yahoo, and checked their headers. Nothing seems to be wrong in the headers. ...
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How to block all email related traffics

I'm recently getting warnings for one of my servers from its provider about sending spam emails. As I don't use the server to send emails, I removed postfix/sendmail, removed MX record from my domain,...
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About mail server and imap ha active-active cluster

I have setup a mail server, for testing. My goal is to have a HA mailserver with imaps, when a client connect to a virtual ip, it redirect to two real servers, if a real server crash the other real ...
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Postfix server sends mails properly, but not recive them

I set up my mail server with Webmin/Virtualmin with Postfix couple days ago. Server lives on EC2 instance. Everything was working just fine. Mails were being send and I recived them properly as well. ...
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91 views

Where are stored my emails?

I am newbie. I created mail server thanks to the tutorial Everything works, but I want to make backup of my emails. I made mysql backup, but email are not there. I checked /var/mail/vhosts and /...
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How does dnf-automatic send emails without knowing a password?

In the dnf-automatic config file automatic.conf I see the following lines under the email section. [email] # The address to send email messages from. email_from = sender@example.com # List of ...
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57 views

Why did I block port 25 incoming on my webserver?

I'm currently in the process of setting up a new (Debian) webserver to replace a very old (Debian) webserver which I also setup years and years ago. I'm trying to "clone" the old webserver as much as ...
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can not add another virtual name postfix postmap

I've been at this,(building a web server), for over a week and have it all working. I've run into every glitch I can imagine, makes me learn. But now I've hit one I just can't make out. In etc/...
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Sendmail sends everything except for mails with recipients of the same domain

I am using the following setup. The client's DNS is pointing to Hostgator, but the client wants to test if his site runs faster on DigitalOcean. So the only DNS records I am pointing to DigitalOcean ...
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Relay Email Server - Need Restricted sender address and recipient address within same domain

This is the first time I am dealing with postfix and I need a clarification regarding Email communication for Monitoring purpose. So, I am going to use around 10 IDs of mydomain to send Email ...
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DMARC strict vs relaxed alignment?

I've been configuring DNS records for a mail server and got stuck when it came to DMARC's alignments. I know that both relaxed and strict are valid options, as well as relaxed being default setting. ...
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How can I resolve the “554 5.7.1 <external.email-address.com>: Relay access denied” error with regards to Postfix on Linux?

Status Currently, my mailing situation is as follows: <internal.email-address.com> (i.e., on my VPS) to <internal.email-address.com> = works :) <internal.email-address.com> to <...
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163 views

connect to alt2.gmail-smtp-in.l.google.com[209.85.202.27]:2060: Connection timed out

I am running in web server on EC2 instance. My domain is registered on google Using Postfix to send mail. Every time i request to send mail this error pop-up: connect to alt2.gmail-smtp-in.l....
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A business email puzzle: Can you combine gmail for staff emails, with another server for a larger-volume sendgrid emails?

We use Google for Business for our staff emails. But we also want to send out automated emails as part of a web-app. Gmail limits the number of emails you can send with a cap (a few hundred a day?), ...

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