Questions tagged [smtpd]

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How to block qmail-smtpd AUTH failed attacks using fail2ban

I need to block a qmail-smtpd AUTH failed, brute force attack in one of my CentOS 7 servers. Here is an example: @4000000062a8757b0681a064 qmail-smtpd[1868]: AUTH failed [62.197.136.xx] spam@xxxxx.com ...
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314 views

Postix to relay SMTP from port 587

I have a debian server with postfix, fail2ban, roundcube, webmin and dovecot installed on it. I have been able to send mails from port 25, but regardless of what I try I can't get it to work from 465 ...
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STMP connection error with roundcube

recently I was trying to install roundcube on my server and everything works fine until smtp test. When I try to connect i always get this error: SMTP send: NOT OK(Connection failed: Failed to ...
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1 answer
108 views

Mail server set up for inbound mail on a subdomain to trigger php script

I'm trying to set my company server up to be able to receive emails to a certain account on a subdomain of our main domain i.e.: linuxuser@subdomain.domain.com Those incoming mailers should trigger a ...
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1 vote
1 answer
338 views

Postfix rejects emails relayed from O365

I have to do a migration of Office 365 from Postfix with Sogo. My goal is to configure small hybrid of Office 365 with Postfix, a bit the same way you do with Exchange On-premises. Currently, postfix ...
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My Postfix server can't send emails to cpanels (Where Port 25 not supported)

I'm getting this error to=<email@email-address>, relay=serverip:25, delay=16, delays=0.38/0.01/15/0, dsn=4.4.2, status=deferred (conversation with serverip timed out while receiving the initial ...
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538 views

Receive email from a custom smtp server with python

I've set an smtp server with smtpd python module with a ddns and an MX record. Now I want to receive email from account like google, yahoo etc, the email it is sent but it is never received, it seems ...
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  • 101
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1 answer
196 views

postfix multiple smtp banner with smtp relay like mandrill, mailjet

I followed the guide to setup postfix with multiple SMTP banners and I am really happy. It works wonderfull. guide: postfix multiple IP SMTP banner The same thing I try to use with a transactional ...
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  • 121
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1 answer
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NOQUEUE: reject: RCPT from 451 4.3.5 Server configuration

Unfortunately after some changes on master.cf and main.cf in postfix I'm getting these errors when I try to send out a e-mail. root@mail:/etc/postfix# tail -f /var/log/syslog | grep "rene.brakus@...
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  • 113
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1 answer
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OpenBSD 6.5 /etc/mail/aliases correct format?

What is the correct entry format for an alias? Right now I have root: xxxx@somewebsite.com Running newaliases -f /etc/mail/aliases yields a syntax error. Are there examples in the manual page ...
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2 votes
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986 views

If I am using dovecot for submission, should I reject all emails sent through postfix?

I have configured dovecot submission service on port 587, with the relay being the postfix server. They are on two different ip addresses/machines. The only way I want email to be sent, is through ...
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1 vote
1 answer
297 views

How to get postfix to check all 'Recieved:' headers against an RBL?

I have several rbls listed in smtpd_client_restrictions, but this only checks the client IP against the RBLS. Is there any way to get postfix to check each Recieved: line against the RBL like ...
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1 answer
859 views

Postfix: define a global concurrency_limit

I need to limit the simultaneous outgoing connections Postfix can make. It is possible to limit the number of connection per destination with transport_destination_concurrency_limit, but not globally ...
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  • 282
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2 answers
250 views

Why my postfix server is connecting to outside IP constantly?

I've set up a VPS which is working fine. I'm using postfix server to send email using PHP. I was just checking the log files and I noticed that my server is getting a connecting request or connecting ...
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3 votes
1 answer
2k views

Postfix: How to limit outgoing messages (smtp) while sender_dependent_default_transport_maps is enabled?

I would appreciate and thankful if anybody could suggest me regarding the following issue I am dealing with for the last 7 days. Current Condition: 1 working mail server (collocation) that host for ...
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Spam from my Debian Stretch server - postfix

I have a huge problem with my Debian Stretch installation. Out of the blue one client email address started sending a huge amounts o spam. My server uses standard configuration. I installed it with ...
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Dovecot SpamAssassin results different than standalone

I'm trying to filter spam with smtpd, spampd, dovecot, and SpamAssassin, and I'm finding different results of a spam email between the X-Spam-Report added by spampd/dovecot (which scores low) versus a ...
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How to bypass smtpd_recipient_limit for single domain?

Can any one help me bypassing smtpd_recipient_limit to 100 or 150 for a single domain in postfix ? Apart from those domain all other domains smtpd_recipient_limit should be 50.
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1 answer
290 views

Postfix daemon connects and immediately disconnects periodically

Postfix's smtpd(daemon used to receive mail) flaps/(connects/disconnects) every 30 seconds with the connection from localhost. May 24 17:33:03 ---- postfix/smtpd[8397]: connect from localhost[127.0....
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  • 121
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438 views

Postfix seems slow, no load, no idea -.-

Our new postfix server we set up just for our weekly newsletter seems very slow, it takes more than double the time our old server at 1&1 did. The last days i tried to figure out whats wrong, ...
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3 votes
1 answer
8k views

postfix/submission/smtpd[xxxxx]: warning: hostname <**> does not resolve to address <IP>: Name or service not known

I installed iRedMail on VPS (Ubuntu). Fail2Ban bans my home IP address. In /var/log/mail.log I see messages like: postfix/submission/smtpd[32149]: warning: hostname unallocated.sta.lan.ua does not ...
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Postfix do not send emails to googleapps email

I am using postfix on one of the server from where I can't send emails from command line. below is the extract of command postconf -n postconf -n alias_database = hash:/etc/aliases alias_maps = hash:/...
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1 vote
2 answers
5k views

postfix allow localhost only local users

I have a little problem. I am offering some clients access to my server in order to execute own scripts (of course in their own chroot environment, etc...). The problem which occured today: Some ...
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Postfix logs to remote log host

On my Ubuntu 14.04 server, I'm using Postfix as a front-end mailserver, and I would like to send all mail related info, including email addresses, to a remote host. In the file /etc/rsyslog.d/50-...
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3 votes
1 answer
2k views

What's the proper way to get smtpd (OpenSMTPD) to pick up changes to smtpd.conf?

I'm new to OpenBSD and in the process of learning OpenSMTPD. I would have expected some sort of "restart" option from the smtpctl command, but it only has a stop with no start which might force a ...
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2 votes
1 answer
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OpenSMTPD wont work at reboot

I just installed an OpenSMTPD server on my arch linux machine. It is working fine when I start it myself, but is failing to start when I reboot the machine. Here is the journalctl -f _SYSTEMD_UNIT=...
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1 answer
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openDKIM breaks email forwarding

After moving our server over to Postfix, I have decided to implement DKIM using OpenDKIM. I have been successfully able to install and run this, but while it is enabled as a milter, all mail ...
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1 vote
1 answer
187 views

Postfix acting like an open relay for domain mailboxes

I have a mail server running on Debian 7.8 configured with postfix 2.9.6. My restrictions are these: smtpd_sender_restrictions = reject_sender_login_mismatch, reject_unknown_sender_domain, ...
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2 votes
2 answers
571 views

Where do these "single-dot" smtp connection failures come from?

I'm running a mailserver based on postfix. There are a lot of connection failures like this: Transcript of session follows. Out: 220 hostname.tld ESMTP Postfix In: . Out: 502 5.5.2 Error: command ...
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  • 121
3 votes
1 answer
17k views

Postfix: Set custom SMTP Banner based on address used to access server

The Postfix parameter smtpd_banner sets the text of a server's SMTP greeting banner. The default setting is: smtpd_banner = $myhostname ESMTP $mail_name My mail server has several unique IP ...
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30 votes
1 answer
30k views

What's the difference between postfix/smtp and postfix/smtpd

A bit confused when reading through the logs of my smtp/mail server, I'm turning this questions to you guys. In the maillog files I'm seeing entries for postfix/smtp as well as postfix/smtpd. I can ...
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0 votes
1 answer
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Why am I getting a 'fatal: SASL library initialization'

If I turn on smtp_sasl_auth_enable=yes <- yes I get this set of warnings and a fatal for SASL. I can not see why it's also looking for cyrus - which is not compiled in. postfix/smtp[87056]: ...
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-2 votes
1 answer
563 views

Issues sending and receiving mail, Dovecot, Postfix etc

I have been trying to fix my mail server for 3 days now. I'm not really new to Debian and Apache and such but I am new to Dovecot and Postfix. At this point I have set up the virtual users and the ...
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-1 votes
1 answer
383 views

Understanding Postfix Mail Log (Part II)

There are several logs like below in my Postfix mail log: Mar 9 06:01:10 postfix/smtpd[23043]: initializing the server-side TLS engine Mar 9 06:01:10 postfix/smtpd[23043]: connect from mlxmail4....
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4 votes
1 answer
16k views

Limit concurrent connections to Postfix server

I'm having trouble limiting the number of concurrent connections from the same client to my Postfix server. Limiting the maximal number of concurrent processes, from the same or different clients, is ...
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1 vote
2 answers
2k views

How to scan mails with amavis from other mailserver

I have two postfix mail servers mailserver1 is running amavis to scan spam and virus mails mailserver2 is running without amavis. My question is how is the smartest way to use mailserver1 ...
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3 votes
1 answer
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550 Recipient address rejected: User unknown (in reply to RCPT TO command) - for an external domain

In postfix, I'm unable to receive mails from the specific domain but I'm able to send mails to it. For some reason postfix thinks the domain is internal, correct me if I'm wrong? Sample from postfix ...
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1 vote
1 answer
4k views

Postfix refuses to send mail to some recipients

I got a third-party application running on localhost trying to send mails with postfix via smtp on the same machine. The problem is that postfix seems to refuse mails to some recipients: Content of /...
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0 votes
1 answer
164 views

Postfix accepts unauthorized requests

Here is an excerpt of my Postfix configuration: broken_sasl_auth_clients = yes smtpd_sasl_type = dovecot smtpd_sasl_path = private/auth smtpd_sasl_auth_enable = yes smtpd_relay_restrictions = ...
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  • 161
0 votes
2 answers
127 views

Receiving mail in a python process on an aws instance

I'm using a Python smptd server on an AWS instance. It's listening on localhost, port 25. I can send mail to it through a Python smtp client on the same instance. I have an elastic IP associated with ...
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2 votes
3 answers
73 views

use two different configs in one postfix, is it possible?

I'm wondering if is it possible to specify another main.cf for the configuration of smptd service in another port paired with normal config in standard port. I know that is it possible to override ...
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0 votes
1 answer
721 views

Incoming hotmail connections timing out with TLS enabled

Okay, this has me completely baffled. I have tried many things to fix this but I'm at my wits end. At the start of June, the server which I maintain suddenly decided to stop accepting incoming TLS ...
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2 votes
6 answers
14k views

SMTP server takes 30+ seconds to accept a message, how to make it faster?

One of our SMTP servers is slow accepting emails, here is the typical output (response time 30+ seconds) from a smtp client script: 2014-02-26 11:44:11 +0800 BEGIN 2014-02-26 11:44:11 +0800 LOGGED IN ...
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1 vote
2 answers
1k views

Postfix noqueue reject

I have own a vServer and multiple domains. The server is mainly used for Websites but I've also set up postfix and dovecot to deliver mail. Everything is working as expected. Even for different ...
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1 vote
1 answer
6k views

postfix welcome message smtpd_banner

I would like to greet the remote client showing his IP. For example: "mysite.com ESMTP Hello xxx.xxx.xxx.xxx your actions will be logged" I have this... smtpd_banner = $myhostname ESMTP Hello $...
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3 votes
1 answer
174 views

Avoiding non-existent domain point to my country's Network Information Center?

I have received an alerting email about the Mailqueue length from the Nagios: Additional Info: WARN - Mailqueue length is 18 (More than threshold: 10) In the mailq, I see some messages like this: -...
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1 vote
2 answers
3k views

What is the exact meaning of "SASL authentication failure: incorrect digest response"

I followed Flurdy's how-to for setting up a mail server on ubuntu. I can receive mails and use squirrelmail to read and send emails. However, I can't send emails through my server using my email ...
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3 votes
1 answer
3k views

Can I use DenyHosts for a SMTP service

I would like to block some hosts that are brute forcing my SMTP server. I'm currently using DenyHosts for SSHD and was wondering if I can add the SMTP service too. It could be possible based on this ...
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8 votes
4 answers
9k views

Receive emails on Amazon EC2 Server

I just got started with an EC2 instance and got my mail sending limit removed, allowing me to send emails from my instance. But due to lack of experience, I have no clue on how to enable receiving ...
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1 vote
2 answers
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postfix rejects incoming mail / 450 error / hostname returns different ip

I'm trying to find why postfix rejected the incoming mail the line from mail.log is: NOQUEUE: reject: RCPT from unknown[xxx.xxx.xxx.1]: 450 4.7.1 Client host rejected: cannot find your hostname, [xxx....
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