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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Local E-Mail sink

I do have multiple mail accounts (personal, university, work, …). Currently I'm connecting from every device (notebook, smart phone, tablet,…) to each of them via IMAP . Setting up multiple IMAP and ...
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197 views

How to configure SMTP with postfix with user and pass

I'm looking for a way to enable postfix (or any other mail delivery system) in which I can easily have aliases (user and domain aliases), and in which I can have an external user send mails through ...
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SMTP connectivity issue in Zenoss (“Connection unexpectedly closed”)

I am using Zenoss for monitoring purpose. I have been using its mail service for a long time. Suddenly my mail service in zenoss stopped and started showing <class 'smtplib.SMTPServerDisconnected'&...
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1answer
77 views

Produce bounce message when Sendmail fails

I'm trying to receive a bounce mail message when an outgoing message cannot reach smtp external server (due to my local internet connection problems). I send emails using: mutt (compose) - procmail - ...
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1answer
90 views

Postfix using external smtp server problem

I am not sure if this is the right stack exchange for my question, there are multiple stack exchange were my question might fit. I have setup my postfix configuration to send my emails through an ...
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1answer
39 views

Does SSMTP cause spam issues?

I am currently using SSMTP to send email notifications from my Icinga server. I am using my web host's STMP server to send the mail, with working authentication details [ eg icinga@domain.com ] When ...
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1answer
237 views

Sendmail issues “530 Authentication required” error message when authinfo is supplied

sender_email - email address that does not exist, but must be used as FROM address, because receiver host rejects emails from other emails. receiver_email - email that is supposed to receive the sent ...
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1answer
227 views

exim4 on debian 7.8 sent mail never arrives @gmail

I followed the instruction on this page Debian Exim and configured my exim with a single file via the dpkg-reconfigure exim4-config setup. Now I can send mails between local users (from root to ...
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1answer
212 views

can i get imap access using just postfix and mailx?

I have postfix and mailx installed on a CentOS 7 server. I am able to send and receive email from the command line using the mailx command. I am also able to read email in each user's inbox using ...
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1answer
60 views

how to set up my mail

I'm just trying to figure out how to use the mail command from the command shell. I've got Ubuntu 12.04 on my laptop. I've been entering the following: user@hostname:~$ mail my_email_address@domain....
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1answer
175 views

Is it safe to remove “received” header?

Is it safe to remove "received" fields created by my mail server for all outgoing mail? For example like this (all "received" headers from my server are deleted by postfix "smtp_header"checks"): ...
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1answer
74 views

too many connection to SMTP server in exim_mainlog, How to solve it?

It is a cPanel server and from /var/log/exim_mainlog, I can see that, there are too many connections to the server. Mostly the number of action connection will be less than 25. But even after ...
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139 views

Firewalld says a port is open, but nmap says its closed

On my CentOS 7 install I'm having trouble connecting one of my email accounts made on the server as an alias on Gmail. I have run the following commands: firewall-cmd --permanent --zone=public --...
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1answer
71 views

Postfix Email Troubleshooting

I'm having some trouble changing the server I use for Postfix emails. I've installed postfix on the Linux server (CentOS 5) and setup as follows. I added the settings to the /etc/postfix/main.cf ...
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1answer
1k views

Why use user@privatedomain@smtp.gmail.com in Mutt configuration file?

I cannot authenticate to my university smtps server with Mutt, with the same error message as http://askubuntu.com/questions/81924/sasl-authentication-failed-with-mutt-and-gmail-why/ L'...
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1answer
62 views

FreeBSD dbmail , postfix port 110 error (220)

I am currently setting up a FreeBSD mail server with DBMAIL and Postfix. I have forwarded port 25,110 and 587 to this server. When I try to log in using pop3 on port 110 my mail program does not find ...
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1answer
437 views

IMAP Dovecot cannot connect

I am trying to set up my own mail server (for 'fun'). I followed this tutorial to the bone. But I get this error message: imap-login: Disconnected (auth failed, 2 attempts in 9 secs): user=<...
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1answer
114 views

Linux SMTP Server For Java Application

We currently have an e-mail processing application written in Java running on a Windows server that we are looking to migrate to a Linux server. The current Windows server has the IIS SMTP service ...
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1answer
517 views

How to configure the “mail” command to use an SMTP relay server without using sendmail service?

Since I new to redhat ver 6 linux I wanted to know how I can configure our web server that is running redhat to used out exchange 2010 relay. I already configure our exchange 2010 to allow our web ...
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1answer
164 views

Blanket blocking SMTP with whitelist

So using a VPS environment, whereby we need to block outbound SMTP by default (spammers), with the ability to unblock when needed. We have found some scripts eg: iptables -I FORWARD 1 -d $VPS_IP -p ...
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0answers
40 views

How to force use SMTP servers in Alpine?

Does anybody know how to force Alpine to use a particular SMTP server from the config list? It seems to choose the first server in the SMTP list in config, but I want to be able to choose the SMTP ...
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0answers
151 views

SMTP works via Mail client but not via openssl

I'm trying to troubleshoot an SMTP issue. My credentials work fine via the OS X Mail client (and in other areas), so the credentials are definitely good. However, when I try to submit them via: ...
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335 views

Confirm DavMail connection

I am using DavMail to connect to my employers Outlook servers. Before I attempt to configure the email client to work with DavMail, I want to confirm that DavMail has been configured properly and is ...
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718 views

Impossible to send mail to microsoft (hotmail, live …)

I cannot send mail to hotmail with my postfix server. I can send and receive mail from gmail and others, but not hotmail. I made an "Authentication Report" on auth-results@verifier.port25.com: ======...
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SMTP Auth - SASL on Dovecot, Postfix and CentOS 6.2 (and Open-Xchange)

I am trying to get open SASL to work on CentOS 6.2. I followed this tutorial: http://wiki.centos.org/HowTos/postfix_sasl I suspect it works perfectly for CentOS 5.x so all I really need is an update ...
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250 views

fetchmail to log complete messages AND pass to mda

I couldn't seem to tell from the fetchmail man page or http://www.catb.org/~esr/fetchmail/fetchmail-man.html#7 whether --bsmtp <filename>.bsmtp.log, applied from cli/cronjob, and --mda <...
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389 views

Sendmail configuration with user mapping on Solaris

I have the following: host1.intra.net which has sendmail and users: user1, user2 & user3. It is running SunOS 5.10. host2.intra.net which has SMTP server. No authentication, no encryption. Email ...
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OpenVPN block SMTP Access Server completely

I've tried almost all iptables rules to block smtp on openvpn server but still clients clients can access remote smtp servers on port 25. I'm using openvpn access server. It's creating two interfaces ...
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40 views

how to find default SMTP server name?

I have a python script which uses smtplib to send out an email. I am not sure what to use for mail server name in the smtplib.SMTP initialization. On my test server I use the below and it works fine. ...
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171 views

gpg: passwordless decryption works in terminal, but not in tmux based msmtp/mutt (can't open /dev/tty)

first try: (with --no-tty in my msmtp config) (reboot) head -n 1 ~/.gnupg/gpg.conf use-agent gpg agent is started: % systemctl --user status gpg-agent.service gpg-agent.service - GnuPG private ...
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258 views

How to enable secure authentication (ssl,tls,starttls) in nullmailer 1.0.5. and upgrade nullmailer to 1.11

I am using a linux based device where we use nullmailer to send email using smtp. nullmailer version: 1.0.5 User-Agent: Mutt/1.5.19 (2009-01-05) In the existing mechanism, our smtp server does not ...
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122 views

Iptables - Limit SMTP output traffic

I'd like to limit the output smtp traffic of my server (Debian). For example : only 10 mails per seconds. I want to use Iptables for this purpose. I tried : iptables -A OUTPUT -p tcp --syn --dport ...
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140 views

Centos 6 and postfix: Internal emails deferred / telnet timed out from SSH

The problem is, that I have a VPS with centOS 6 installed, and I can send emails to anyone, but my own exchange server, Apr 29 11:50:30 amazonnet postfix/smtp[16535]: 2B6FF3CC49A: to=, relay=gmail-...
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333 views

Postfix multi IP/Domain SMTP Helo'ing

We have Postfix running with two domain and each domain has own IP so it's isolated. But Spamhuaus blocked my IP and saying you are sending "localhost.localdomain" HELO I am already using ...
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What is error code 68 for msmtp and which problems may provoke it?

Sometimes, when I send mails (from alot MUA making use of msmtp) I get the following error message: failed to send: msmtp --account=FOO -t failed with code 68: A process has ended with a ...
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224 views

Hotmail not receiving emails from a script, but works from the server

I have a working mail server running Debian stable, the following elements are working. SPF DKIM rDNS My IP is not listed in any backlist, I used: mxtoolbox.com for all this. My problem: Sending ...
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How to configure postfix to send mail to external SMTP server?

I have a machine with http://phabricator.org/ set up on it and I would like to set up postfix to enable e-mail sending to my company's mailboxes (as for notification emails coming from e.g. ...
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156 views

ssh log sent to email in Cygwin

I am using Cygwin in Windows 7. I am trying to make my syslog-ng daemon send a ssh log via email to me when ever someone tries to log into my computer. I tried using the code below (entered into /etc/...
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161 views

How to disable SMTP auth plain for Citadel 8.20 on Slackware 14.0?

How do I turn off SMTP AUTH PLAIN for Citadel 8.20 on Slackware 14.0? If I set up postfix to handle SMTP would this allow me to not have SMTP auth plain enabled
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opensmtpd - configuration for sending email only

So what do I want for a unix server (OpenBSD 5.9 for the record): smtpd is OpenSMTPD 5.9.1 send email to the "Internet" from local users with "from" in enveloppe and "From:" headers to be of the ...
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Why don't I receive mail although I get a 250 OK response?

I'm trying to send a mail with telnet. Everything seems to be OK but I don't receive the mail. Here is what I do inside my terminal on Debian 8: telnet localhost smtp 220 simon ESMTP Exim 4.84_2 Tue,...
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mail server for small MX domain & few email accounts

Is there some free software mail server for Linux (at least IMAP + SMTP), offering also some web interface and good spam filtering, which is specialized for small MX (in the DNS) sense, and few email ...
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59 views

`SMTP session failed: 501 5.5.4 connection. dafafkKHJDHJSnaf.50 - gsmp` error in mutt

My mutt was working fine a week ago. Suddenly it has stopped working with gmail. It throws the following error: SMTP session failed: 501 5.5.4 connection. v9sm74425825pfi.50 - gsmtp When I postpone ...
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RHEL Jenkins email notifications failing

RHEL Server release 6.7 (Santiago) I know there have been multiple questions about this on SO (none of which have helped me solve my problem), but I think my problem pertains to Linux more so than it ...
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I use OpenSMTPD on OpenBSD 5.8! How can I automatically encrypt E-mail with OpenSMTPD

How can I automatically encrypt all outgoing E mail? My scenario: I use XXXX@gmail.com as my relay for all Emails my OpenSMTPD Server forwards All Emails to me as well as all Emails from somewhere to ...
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191 views

Dbmail / Postfix Send mail to local adress

I have a FreeBSD Server with Postfix and DBmail. The mail system is working perfectly except for one thing: I cannnot send an email from domain1.com to domain2.com if they are both hosted on the same ...
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Where can I find either a)my SMTP log and / or b)determine/toggle whether or not SMTP is being logged at all

My server sends out emails via sendmail or SMTP, depending on the situation. I am trying to find logs for SMTP. Sources indicate that I should look at /var/log/maillog (http://serverfault.com/...
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my domain server instead of localhost

I was using localhostin my script for sendmail. Now I am not allowed to use that. I have got a domain hosted at the same hosting company. How do I rewrite the portion of the script $smtp_server='...
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144 views

Postfix - send email from catch-all adress

I have a domain with a catch-all address. Let's say every mail with @example.com as destination-domain will be routed to my primary address. That is working fine with postfix and virtual addresses. ...
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4k views

SMTP Issue: did not issue MAIL/EXPN/VRFY/ETRN during connection to MTA

We had a urgent requirement for creating a mail server to send mail for our Portal application using Liferay. The mail account will be an administrative account to maintain the portal. I was able to ...