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

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52 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
140 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
188 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
127 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 ...
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1answer
117 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 ...
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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, ...
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1answer
227 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 ...
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1answer
73 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 ...
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60 views

Email not getting sent through the script on vps parallels

We have a web site hosted on the vps parallels server and we are trying to send mail to the email id which is hosted on godaddys email plan xyz@ourdomain.com , but we are unable to send mail through ...
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1answer
79 views

Where does e-mail header “Received: from…” come from? [closed]

I sent myself an e-mail from my server to my gmail account, here is one of the headers (partially redacted): Received: from cpvds3xx.xxx.com (dev1.xxx.com. [209.51.132.xxx]) by mx.google.com ...
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2answers
359 views

Why is email being delivered normally despite an SPF “hardfail”?

I'm trying to figure out why forged email is being delivered to major email providers (gmail.com, outlook.com) even though email is marked with an SPF hardfail. The email is also delivered to ...
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1answer
45 views

Is extra “Received by” in mail headers bad and can I remove it?

I use our own VPS web and mail server to send out a newsletter regularly to 50,000 addresses. I am trying to improve deliverability and was looking through some of the thousands of bounce emails. One ...
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1answer
45 views

Conditionally prepending a string to mail subject in Exim4

I have a custom solution for implementing mailing lists using only Exim4 and a SQL database. Basically, most of the hard work is done in a single router, which checks on various conditions, does ...
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1answer
48 views

Is there a legitimate reason to use an encoded word in any header other than the subject?

Encoded words allow non-US-ASCII characters to be encoded as US-ASCII and thus placed into email headers. http://en.wikipedia.org/wiki/MIME#Encoded-Word Encoded words are often used in the Subject ...
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2answers
335 views

Postfix: bouncing mail (reverse DNS issue)

I have a problem with Postfix. I get this with some email address: to=<mail@domain.tld>, relay=mail.domain.tld[IP_ADDRESS]:25, delay=3, delays=0/0/2.5/0.52, dsn=5.7.1, status=bounced (host ...
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2answers
68 views

How to properly set TXT SPF record when separating A from MX records [duplicate]

I have current TXT record for my domain: v=spf1 a mx ip4:{ip-of-my-server} -all Both email traffic and website goes to same machine. Now, I have to point website (A record) to other server. Will ...
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1answer
18 views

Precedence/co-existence of SPF and DKIM

Is co-existence of SPF and DKIM specified somewhere (assuming the absence of DMARC)? I want to put only my own IPs in the SPF and let 3rd parties send mail on behalf of my domain using DKIM. What ...
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1answer
62 views

How to unable mail.example.com from browser (ISPConfig)? [closed]

I am running under Debian 7 + ISPConfig 3. I have recently configured the dns (at OVH web hosting service) so that ISPConfig manages the dns zone. For foobar.com, I have a MX record that points to ...
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1answer
32 views

In postfix, how can I override catch all to keep one account's mail local?

To catch all mail sent to myexample.com and forward it to another address we use the following in virtual: @myexample.com myexample@gmail.com However, we would like to keep all mail sent locally to ...
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1answer
65 views

Where is the email bounce sent? To the @domain or to the IP that sent it?

When I send an email from noreply@mysite.com to user@yahoo.com and I use that VERP bounce format like bounce+user=yahoo.com@mysite.com Is this bounce back sent to the mail server in DNS records of ...
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2answers
63 views

postfix setup: relay access denied. Help me understand

I'm trying to setup a postfix server for testing our app which uses oracle mail library javax.mail to send mail. The app works fine as I'm able to use google, our own mail server, etc to send mail. ...
3
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2answers
411 views

Is it ok to use self-signed certificates for smtp transport?

By "by ok to use" I mean: are MTA agents receiving emails from my server going to reject my email if not, are they going to make other kind of bad treatment for my emails (marking as spam, unsafe ...
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1answer
129 views

How to configure postfix/dovecot setup to reject certain mail

I followed this (https://workaround.org/ispmail/squeeze/big-picture) tutorial to set up my mailserver and it works very well. I'd like to be able to reject email from certain users or if it contains ...
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2answers
562 views

Exim on Centos - Configuring gmail smtp

I want to set up Exim to send the mails through my gmail (actually my domains google apps). I have added the router, transport and authenticator. Specifically: gmail_route: driver = manualroute ...
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0answers
12 views

Email duplicated from Barracuda Cloud layer?

Incoming email to our domain first goes to the Barracuda Cloud Protection Layer before being passed to our local Barracuda 300 antispam appliance. It then goes to our email server (CommuniGate). ...
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1answer
136 views

Configure Ubuntu 12.04 LTS for Sending Emails for/from Multiple Domains [duplicate]

I have a cloudserver running on rackspace with Ubuntu 12.04 LTS The server is a LAMP stack that runs multiple live websites. Most sites are wordpress while others are PHP with a few scripts that use ...
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2answers
87 views

SPF/DKIM Configuration for usage with critsend

I am currently facing the following issue: I have configured a domain of mine to be used with the Critsend mailing service. Their recommended configuration for both SPF and DKIM was implemented on ...
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2answers
85 views

Postfix: Filtering Outgoing Mail According to Sender Subnet

I need some specific LAN subnets to send e-mail to only my corporate domain such as printers or kiosks. How it could be possible via Postfix?
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1answer
65 views

Mail server is seen under different IP by other mail servers, than it has --> mail marked as spam

I am experiencing problems with delivering emails from my server and can't see the real cause of this problem. Emails from my mail server are marked as spam. In message sourcecode I can see, that my ...
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1answer
112 views

Contact sender via Postfix Mailer-Daemon on “Bad recipient address syntax”

I would like Postfix to generate and contact via Mailer-Daemon the sender recipient when the following case occurs Bad recipient address syntax. I've been reading through Postfix docs but haven't ...
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2answers
67 views

Email flagget as spam or rejected by recipient mail server

I have configured smtp service on a windows 2008 server. All the emails sent by the smtp service are flagged as spam or they are rejected by the recipient of the email. In the header of the email I ...
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1answer
46 views

exim4 not sending email as intended [closed]

I am setting up a server that needs to be able to send email from my email account that I have through my hosting provider "JustHost". I have been trying to get it to work with internet and smarthost ...
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0answers
794 views

postfix queue active and mail transport unavailable

I am not very familiar with postfix, but I am pretty sure that what I am seeing in my logs is not a good thing, and I was hoping someone here might be able to shed some light on what is going on and ...
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1answer
47 views

Make a copy of email using pipe in postfix alongside 1 content_filter

I am using postfix and already usHi. I am using postfix and already using a script as a content_filter which re-injects back to smtpd to all users, but before this happens, I would like to make a copy ...
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0answers
37 views

Exchange 2010 Blocking Twitter

I am responsible for a windows network with an Exchange 2010 server. It appears that we haven't been receiving twitter emails for quite sometime, maybe even as far back as just before ...
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0answers
2k views

550 5.7.1 Message Rejected due to content restrictions

I have a server that for some reason, out of the blue is now having a huge amount of its email being rejected, coming back with 550 5.7.1 NDR's or various derivatives thereof. This just started ...
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2answers
57 views

Why my Postfix is trying to send emails over Google smtp? [duplicate]

Im trying to set to my postfix send e-mails from my server, not from Google SMTP and it keeps trying to send over Google's SMTP: Feb 20 22:04:14 elusive postfix/smtpd[9008]: connect from ...
2
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0answers
199 views

How to stop double-bounce FROM sender in postfix

I am getting huge amount of these in my mail log, and unable to find its originator. What could be the reason? Here is log entry: postfix/cleanup[9626]: 4413082E40: ...
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0answers
30 views

How to configure Postfix to only send out emails with a certain header?

I'm setting up a local development VM and I was able to redirect all sent out emails to a local mailbox using virtual_alias_maps with the entry /.*/ username. What I'd like to add is an option to not ...
0
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1answer
17 views

including an external file in postfix aliases file using “:include:” directive

Some entries in my postfix alias file are static, whereas others are intended to be dynamic, and updated via a cron-job script every hour. I would like to have the static entries be in a file by ...
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1answer
29 views

Mail() in php do not send when \n character in header

I've some scripts like this one to send emails: $content = "<html><head><title>xxxxx</title></head><body>blabla</body></html>"; $headers ...
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2answers
56 views

Redirect mail from system user account to real email account

First, I would like to thank you for your time. I've come to the following situation: I've got a mail server named mx1.domain.com This mail server is virtual hosting some domains mail accounts like ...
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1answer
133 views

hMailServer forwarding and distribution lists with SPF checking

I have installed and configured hMailServer, primarily to allow me to create a distribution list for a private organisation, and some email address aliases. This is so that members of the ...
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2answers
142 views

Using a CNAME to forward traffic from a naked domain

I have a domain, flyh2.com. I use a CName to forward www.flyh2.com to flyh2.elasticbeanstalk.com where my web site is hosted. This is the only way Amazon allows custom domain names. A records aren't ...
2
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1answer
85 views

BCC every incoming and outgoing e-mail in Microsoft Exchange

A content inspection system wants to inspect every e-mail that is sent or received outside organisation's boundary (e.g. from/to Internet). I do not want to put the inspection system in-line as an ...
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0answers
31 views

Email being lost from a specific domain

Today I experienced the loss of email from a specific domain. I can initiate the sending of the email from a vendor website, watch it show up in the logs, but it never arrives in my mail client ...