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SMTP is a protocol built upon TCP/IP, used for outgoing email transmissions, and email relaying. It uses ports 25 (clear) and 465 (SSL) by default.

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I need to add a new account to Outlook. This account belongs to a postfixmailserver. For POP settings, I set port number 110 for incoming and port number 25 for outgoing mail. As the server doesn't ...
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PostfixAdmin installed successfully. To test whether internal sending and receiving mail work, I used SMTP to send mail: telnet mail.example.com 25 Trying 94.284.174.110... Connected to mail.example....
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Almost always I can see many smtp processes in ps aux command output like this: postfix 924674 0.4 0.0 44460 9212 ? S 18:54 0:00 smtp -t unix -u -c postfix 924675 0.2 0.0 44460 ...
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I'm currently attempting (and failing) to set up an SMTP mail server on my Ubuntu server so I can recieve emails from the contact page of my php based website. I was planning to send these emails ...
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I am trying to set up a mailserver using OpenSMTPD. My configuration is: listen on enp4s0f2 action "save" maildir "/mail/%{rcpt}" match for rcpt-to regex ".*" action &...
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🔍 Context I'm working on a Lua script that sends emails via SMTP with STARTTLS. The script successfully connects to the SMTP server, but authentication sometimes fails with the error: authentication ...
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I've Thunderbird 115.13.0 on Ubuntu 22.04 and I have my email which is configured properly automatically by Thunderbird for IMAP and SMTP servers from Microsoft outlook office 365. However, now it has ...
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I'm running protonmail-bridge on a server on my home network, and I'd like to have several other machines utilize it as their IMAP/SMTP server without having to run duplicate copies of the bridge ...
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My Requirements I have two email servers, james and winmail. They hold same users, for example, account [email protected] exists both in james and winmail. When someone sends a email to [email protected], I ...
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We use Postfix on a RHEL server to distribute email to our opted-in users each morning. We recently enabled smtp (outbound) TLS. The majority of our email is delivered on Trusted TLS Connections. ...
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What am I missing... Given: Linux-stack based email server system (hosted) with webmail component. Various email clients and other webmail systems involved and tested with this. We are distributing ...
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I have a VPS server, which is used to send emails. On that server I have 2 domain names attached and correctly configured with 2 different IP's. DNS is set as well to match sending IP's accordingly: ...
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is there a way via Postfix and or procmail for example or another software to forward e-mails from one inbox to another 2 inboxes where each message goes either to one inbox or the other based on ...
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I found the following in the logs: sssd_kcm[425899]: Starting up postfix/submission/smtpd[425910]: initializing the server-side TLS engine postfix/submission/smtpd[425910]: connect from unknown[::1] ...
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I've come across different names in different places: Light MTA, Remote MTA, Smarthost, etc. Generally, I do not want to install a full-fledged mail server (such as sendmail, postfix, exim), but only ...
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A small node operates several web applications attached to a domain. The same domain is used for mailboxes, hosted off site by a commercial service. On the name server operated by the registrar, A, ...
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So I have setup an OpenSMTPD server on my OpenBSD VPS. I have specified the aliases file path and configured action "local_mail" to forward the mails to specific users based on their ...
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I'm trying to host a postfix mail server.I have a box with a fixed IP and also a mx record and spf record that link my box IP to my dns record. I can telnet to alt4.gmail-smtp-in.l.google.com 25 but ...
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As described in the subject, mailx -a somefile.txt -s "blah blah" [email protected] hangs, while emails sent via cat somefile.txt | mailx -s "blah blah" [email protected] ...
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i trying to setup Postfix SMTP on my CentOS 7.8 i following https://www.middlewareinventory.com/blog/postfix-relay-office-365/ and got stuck on this error May 30 21:36:28 pbx12 postfix/qmgr[15174]: ...
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I install a postfix with the following postconf -n:(however I changed my domain to example.com) alias_database = hash:/etc/aliases alias_maps = hash:/etc/aliases append_dot_mydomain = no biff = no ...
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I am running 3 x Win11 and 1 x Win10 all with Office 365 Outlook. 3 of the Outlook clients connect to a postfix/dovecot server just fine on my home NAT, and can tunnel through my router from the ...
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I've to send a HTML file with mailx command but when I receive the email with the mark up code showed like this : <HTML><HEAD><TITLE>Title One /TITLE> <STYLE> body { ...
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Opening a web page attempts to access SMTP server in the network. I am not able to identify exactly which URL is attempting for the same. Due to nature of the work, many tabs are open in the browser. ...
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I run a small webserver that hosts a handful of domains which I use for personal and testing purposes. I want to set it up as a mail server as well, and I'm trying to understand the rDNS lookup that ...
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I'm using Vultr for Web Hosting and according to them they have unblocked all SMTP Ports (25, 465, 587, 2525). Now after setting up apache server and installing Postfix, Dovecot and SpamAssassin when ...
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Any email clients for Linux with capability of sending an email multiple times to mail-list recipients individually? Up to 30 recipients, if it is important. P.S. No, python script does not work ...
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I have automated some stuff using AnsibleTower (4.1.1, RHEL8 4.18.0-372.19) and it works as expected. Yet when it comes to sending email notifications, there is something I cannot explain. The Tower ...
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I'm trying to figure how opensmtpd can be used to relay email using a specific host, which should be figured with an MX lookup. Let's say that i have my MX record for internaldomain.server.lan. This ...
Francesco Colista's user avatar
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I'm looking to set up a simple Postfix server that can modify the content and recipient of some specific SMTP messages. I'm not super confident in my approach so far and feel like I missing some ...
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Currently, I am working on a project where I use telnet to netcat to send an email message within my university. I am trying to make the process automated but my script can't seem to enter in any ...
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I use two OpenBSD machines (notebooks) that have configured mutt clients. One of them has OpenBSD 7.0 on it with mutt version 2.1.3, while the other runs OpenBSD 7.1 with mutt 2.2.3 . Both of them use ...
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I am currently rolling out a Postfix/Dovecot configuration on our servers to replace our monolithic mail server. On the test enviroment I have everything set up and it worked there. Now I am rolling ...
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The question is mainly stated on the title. I was wondering if it is possible to configure Postfix in such way. More specifically, if I control domain "example.com" I'm asking if I will be ...
tur11ng's user avatar
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I have a website with forms where users can send us requests. In addition, the site sends a predefined email to the client. The form receives spam (big surprise) and I'm trying to block emails from ...
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Ignoring the fact that not all mail servers support TLS: Is there a way to announce to the world that we would prefer that our inbound mail be delivered via TLS and verified as signed by a trusted CA? ...
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I'm wondering if it's possible to publish (and receive) a malformed hostname (e.g. a hostname starting with a digit or with a hyphen, etc.) in MX lookups? Does the DNS server usually validate MX ...
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Does sendmail support TLS_Clt access matching based on blocks of IPs? So far the official sendmail TLS documentation I have found does not indicate that it does (nor that it doesn't).
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I want to reject email from certain senders (ie, the MAIL FROM sender) whose domain appears in a type:table map if the transport is not via STARTTLS. So if [email protected] sends an email then I ...
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How do I specify a default sender 'from:' address in postfix config for emails through smtp? I'm trying to send emails through SMTP and a relay from two different servers with Oracle Linux 8 The ...
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Telling story short. My MacOS version is: 12.4. In /etc/postfix/: In sasl_passwd i have: smtp.emailsrvr.com:587 <myEmail>:<password> In main.cf i have: # custom POSTFIX email sender ...
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I wrote a python script that checks a website and eventually sends an email. I copied the script to my raspberry and when I execute it via ssh it works fine. But when I let it execute by the crontab ...
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I am trying to telnet a port at a client's location. telnet someexampledomain.com 25 It shows: Trying someexampledomain.com... telnet: connect to address someexampledomain.com: Connection timed out ...
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Does anybody on this planet know what the equivalent GNU mailutils command to the following looks like? Is this even possible without a local MTA with mailutils? Using s-nail it works as intended. s-...
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I want to configure a Centos 8 machine to send emails via an external SMTP relay. (I control the Centos box and have no control over the external relay). I've read countless posts on how to set up ...
Danny's user avatar
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Upgraded Postfix to 3.5.8-2.el8 on RHEL 8.5 and started seeing below in /var/log/maillog: postfix/smtpd[7575]: discarding EHLO keywords: CHUNKING Reviewed main.cf and master.cf but can't see any ...
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postfix configuration: ~ # postconf -n | grep mynetworks mynetworks = 127.0.0.0/8 mynetworks_style = host smtpd_recipient_restrictions = permit_mynetworks, permit_sasl_authenticated, reject ...
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Since I upgraded my server from Debian Stretch to Debian Buster, clamsmtpd is always running under the clamsmtp user althoug I specified to run under the clamav user in /etc/clamsmtpd.conf file. Here ...
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I am trying to reconfigure a (currently working) debian 10 postfix configuration because we have moved to Office365 as SMTP server. The postfix mail configuration is only used for sending out mails ...
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I'm using msmtp to deliver system email from an Ubuntu server via an SMTP account. Can I somehow configure this setup to rewrite all emails to one specific recipient address? If so, how? Or put ...
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