The server configuration of email, including POP3, SMTP, IMAP, and popular server software packages that control email.

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75 views

Adjust Authentication-Results header and verify DKIM reports are being send

i'm running OpenDKIM 2.9.1 through Postfix 2.11, using the following configuration. https://gist.github.com/sibok/97a8e33d5f7309b4fa1c As you can see i enabled DKIM reporting but i can't see any ...
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1answer
25 views

How to log mail client with Dovecot / Postfix

Does anyone know if it's possible to have Dovecot or Postfix output the mail client of a user? In Dovecot's variables list, I cannot find anything in that direction.
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1answer
78 views

Sending mail from PHP gives Unrouteable address

I have a Debian server running PHP and Exim4 (among other things of course). The PHP application is sending 1000s of emails every day all of which work fine, however I now have a new customer and my ...
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0answers
32 views

Amavis sending Paypal payment emails to postmaster. Are they classified as spam/virus?

Some days ago i was reading some docs about amavis and decided to fine tune its configuration. As i'm new to amavis i probably setted some statements in the wrong way so last days i've been recieving ...
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1answer
32 views

Is open relay to local users the right way to work on port 25?

today i was checking my server Postfix restrictions when i realized anyone who meets a very basic requirements like not being in a black list, also anyone who communicates to the server properly, etc. ...
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1answer
20 views

Understanding sendmail -bt in conjunction with aliases

I'm familiar with exim and the behaviour of exim -bt in indicating how a message will be routed. I'm trying to set up a trivial sendmail configuration to route root mail on a local system to my ...
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1answer
26 views

Postfix not mapping UNIX users with @ character

What I want to achieve: On my production server, I'm planning to have multiple users and multiple domains and my best option is to create full email-address-format unix user - when John Doe requests ...
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0answers
77 views

Login to SquirrelMail as a virtual user

I am on CentOS 6 with Postfix, Dovecot, and PostfixAdmin. I have configured an external domain with the user me@domain.com as a virtual user. It's receiving mail without a problem at ...
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1answer
80 views

“host lookup did not complete” error

I need to send mail from sub.domain.com but delivery to one address fails with an error "R=lookuphost defer (-1): host lookup did not complete". Additional information that might be relevant: My ...
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0answers
276 views

Postfix: Reject forged sender/from address

currently, i find myself in the situation where once Postfix 2.11 has been configured to properly reject outbound forged emails addresses when sender login mismatches and also when sender address does ...
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1answer
87 views

postfix not sending mail from localhost

I am having a problem sending mail from the server. The issue was spotted because as php mail() is failing to deliver any messages. I have checked the mail log on the server and found the following; ...
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2answers
35 views

Does the spam keyword appear in mail log means that the email is marked as spam?

When looking at my mail log I have noticed the following: mail/mail.log.3:297:Mar 30 18:31:21 www postfix/smtp[21129]: 7A6C51014035D: to=<XXXXXXX@aserve.com.tw>, ...
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1answer
34 views

Postfix MySQL percentage error in query

I have a somewhat complex SQL query that I'm using to get alias forwarding e-mail in Postfix. The problem is that Postfix uses %s as it's insert of alias mark in the SQL query. I think this causes the ...
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1answer
172 views

Postfix: “Connection timed out” on all outbound email

I've been attempting to setup mailing lists with GNU Mailman but it's been a complete disaster with tons of road blocks. Postfix is able to receive email but not send it back out at all, I've peeked ...
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3answers
47 views

Procmail or/and dovecot? [closed]

At my class project I'm asked to install and configure a mail service, to do that I have to : Install and configure postfix Install and configure Procmail Configure postfix authentification with ...
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1answer
56 views

PHP : how to find the undelivered email location in my local system [closed]

I need to send verification emails to the users. I have used the PHP mail() function.The code is mail("ajin@gmail.com","helo","hai","ajin"); but I don't have a mail server so I think the mail ...
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2answers
59 views

S/MIME certificate to minimize email bounce

I have a website hosted in a vps that sends informative emails to my clientes, maybe 20-40 emails per day. Since few weeks ago some sent emails are bouncing with the following error: This message ...
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2answers
92 views

If I use postfix for mail relay, so is myhostname / mydestination important?

I use postfix to relay mail to 3rd party SMTP and never sent out email directly, and of course I never receive email. So If I set myhostname / mydestination to sth like fake.mydomain.com, which ...
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2answers
139 views

501 HELO no reverse dns name

I have a dedicated server with a public ip running postfix with multiple domains. The emails are coming in all right but when I try to send mails from this machine they often get bounced back by ...
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0answers
57 views

Postfix configuration with DKIM to send mail from multiple domains

My current setup is a Postfix installation configured with DKIM on a server with hostname prod01.example.com The server is used to send out mail on the form webshop@example.com, ...
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1answer
77 views

Email sent from my new server, being suspended by SMTP because “weird” hostname?

I have some problems sending emails from my server: I've been banned/suspended for abuse (IP blocked) by the SMTP server. This happens only on my new virtual server. Right to the question: is my new ...
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0answers
63 views

Postfix with Dovecot on Ubuntu - create group for local users only

Could someone provide me with info how to setup Postfix mail server to have one special group of users whom will only have a permission to send or receive mails inside domain. They can not send mail ...
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1answer
24 views

Hierarchy of Scanning Outgoing Mails on a Secure Email Gateway

Good day. Can anyone help me determine what could be the standard hierarchy of scanning outgoing mails on a secure email gateway (regardless 9f the vendor)? Should mails be scanned by policies before ...
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1answer
68 views

GMail or Office 365 for small businesses with LOTS of domains [closed]

Sorry if not the right place to ask, I'm pretty new here (mostly post programming questions on SO). I work for a small company, about 5 employees, but we have 5 different domains we use for sending ...
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1answer
28 views

Setting Up PTR to correct “Forged hostname” error

Our e-mails mostly get through fine, but here's an error I haven't seen before. Diagnostic-Code: smtp;550 5.7.1 ... Forged hostname for 66.132.221.45 >which resolves as www.medialabinc.net but ...
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2answers
276 views

Is the 10-DNS-lookup limit in the SPF spec typically enforced?

My understanding is that the SPF spec specifies an email receiver shouldn't have to do more than 10 DNS lookups in order to gather all the allowed IPs for a sender. So if an SPF record has ...
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0answers
56 views

Outlook 550 5.6.0 unacceptable content

A user is using Windows 7 / Outlook 2010 SP2 with emails going through a Jerseymail POP3 setup. He is receiving a bounce back as soon as he clicks send - The following recipient(s) cannot be ...
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1answer
68 views

How to check the existence of an email address in yahoo without sending [closed]

I did several methods to check whether an email address in yahoo is valid or not by using via perl module and also by postfix MTA probing method. In all these methods it tried to sending mails to ...
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1answer
47 views

Emails in a VPS solution [closed]

A little of my own background, I'm a webdeveloper and used to the likes of shared hosting, at my new job I have become accustomed to working with our own servers (running CentOS) and the Linux ...
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2answers
110 views

Postfix reject client from domains without MX records

Machine mail.domain.com send email for domain.com through Postfix 2.11 but today reviewing mail.log file i noticed some Wordpress on machines wordpress.domain.com and blog.domain.com as sending email ...
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1answer
113 views

SSL Cert error after migrating to hosted exchange service

OLD SETUP SBS 2011 w/ Exchange and all clients running Office 2010 (using rpc/http as many were laptops) NEW SETUP All mailboxes and accounts moved to hosted Exchange. Local Exchange services ...
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1answer
72 views

Random synchronization error on SMTP server

We can send mails across the network from 1 server to another via a centralized smtp server. However, the we get a synchronization error on the server randomly. So for example if we send a simple ...
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2answers
46 views

Search logs for unique email addresses

I want to search my log-files and only show unique email-addresses that is preceeded by "MAIL FORM:" For example if I search maybe I got those hits: Mon 2014-03-17 00:01:38: <-- MAIL ...
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1answer
84 views

SMTPD restrictions

i'm looking for a bit of advice on Postfix restrictions configuration. I'm looking for a balanced configuration which properly rejects spam and unauthorized access retries. Lately, i've been reading ...
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0answers
42 views

Courier IMAP namespace prefix not used by default on iOS

On OSX Mail.app, connecting to my Courier IMAP server, everything is working fine. I can read mails, delete stuff, move it to trash. However, when using the same server on iOS, I get error messages, ...
2
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2answers
164 views

SELinux preventing /etc/aliases email pipe to script from working

When somebody sends an email to my server, e.g. somestringthatisnotnecessarilyauser@myserver.com I want it to pipe to a PHP script. So in my /etc/aliases file I have: ...
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1answer
41 views

Postfix regexp map for mailboxes

I need to forward all email that comes to mailbox by some mask to one specific mailbox. For example if recipient mail is 79001234567 it should be forwarded. line from /etc/postfix/main.cf ...
2
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1answer
59 views

Disable mailing in cron globaly

The web is full of suggestions how to disable mailing in cron like asked here stop linux from emailing me cron errors?. Is there really no global config flag I can set to disable mailing in cron for ...
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0answers
51 views

SASLAUTH: Temporary block on more than 5 authentication followed failures

I'm running a Postfix MTA together to SASL when it comes to authentication. Yesterday saslauthd collapsed and none of the email users could login to the mail server. What i think is probably ...
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2answers
137 views

How to stop or prevent Postfix / smtpd / Sasl brute forcing

There are numerous attempts to connect to my mail server in order to send mail either unauthenticated or to guess username and password to, I suppose, accomplish the same. Should I fight against ...
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3answers
96 views

Despite of several attempts, unable to open port 25

This question may have been asked many times here but after several failed attempts, I repeat the history: How do I open port 25 port on my server running CentOS. Here is my iptables config: Chain ...
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1answer
185 views

Amazon SES Strange Email Format

My email logs are filling up with bounced emails being sent from my domain with a From header formatted like so: root@support@mydomain.com What is causing this? Full log entry: Mar 13 14:05:09 ...
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0answers
123 views

Exchange 2013 - Default email policy with lowercase emails?

I've been trying to apply a custom email address policy to our new Exchange 2013 server. By default Exchange gives users capitalized emails address. Eg - Firstname.Surname@contoso.com I've done a bit ...
1
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1answer
110 views

Why can't some CPanel Webmail users login from only one location? [closed]

I need some help with a Cpanel Webmail situation our client is having. This is my first question here. Hope I'm clear in explaining: Three users(and possibly more) at one of our clients can't login ...
1
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1answer
79 views

Exim routing based on individual email addresses

I am trying to migrate individual users, one at a time, from an Exim based mail system to an Exchange 2010 system. I'm hoping to do this by leaving the Exim based system as the MX for the time being, ...
0
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1answer
220 views

Postfix alias [user unknown] issue

So I need to create an alias on my postfix server that will redirect all mail to multiple email addresses. I have postfix + postfixadmin with dovecot up and configured and everything seem to be ...
0
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1answer
72 views

I'm sending email via command line using linux accounts but it is adding @mail.hostname.com

mail -s "subject" $user I'm sending email via command line using linux accounts but it is adding @mail.hostname.com so the username becomes user@mail.hostname.com Is there are way that it just ...
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2answers
38 views

How to automatically send email when process is using more than xxxMbit/s

I haven't found anything for that. How could I automatically send an email (via crontab) with the ID of the process, the user & finally what's the name of the process for example when this process ...
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1answer
56 views

How to setup my email infrastructure (small company) [closed]

I am new to the field and I am trying to learn. I have a domain name (let's say mydomain.it) registered with Company A. Company A provides me both a DNS service and a Mail service. I use the DNS to ...
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0answers
20 views

postfix wont receive some confirmation email

I have set up a postfix+dovecot email server on my ubuntu 13.10 server. For the most part it works, I can send emails fine and receive most emails fine, except for a few. The only ones that I can't ...