Refers to the hardware or software that make up a server dedicated to sending and receiving emails. Many popular modern email servers bundle other functionality for contacts and calendaring along email delivery.

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1answer
37 views

Why use both Dovecot and Postfix? [duplicate]

Just out of curiosity, there are dozens / hundreds of tutorials helping you setup a Dovecot - Postfix mail server. On the surface, both of them are email servers, why use both? Mail servers are ...
-2
votes
0answers
20 views

Exchange 2013 Receive Connector Scoping and Open Relay

I have an Exchange 2013 server which was a victim of spam infiltration, and the exchange server was being used as an open relay for unauthorized users (and domains) to remotely send spam. I have done ...
0
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0answers
27 views

How do i setup my server so that gmail does not mark it as spam [duplicate]

I have setup my domain mydomain.co.za and put an spf record to my server ip, example 123.456.789.123 when i send an email to google my postfix log shows Aug 24 20:39:25 myname postfix/smtp[21855]: ...
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votes
1answer
12 views

zimbraAdmin monitor show server from previous installation

If I open zimbraAdmin and go to configure - servers only the current server is shown. But if I go to monitor - server status there is a server from a previous zimbra installation, and all services ...
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votes
2answers
54 views

Reject email if “rcpt to” does not match relay_domain - Postfix

My mail server currently shows up in mxtoolbox as Open Relay. Objective: Allow SMTP connection only when RCPT TO: says example.com What changes should I make in it so that, it would reject the ...
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0answers
14 views

How to use different server for emails [closed]

I have a ubuntu 14.04 running on my server with AWS I have very basic installation of nginx mysql and php on the server. I am using my servers ip address as A record for my domain. Now the email ...
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votes
1answer
47 views

Postfix not recieving mail from Gmail

I've Installed Postfix with Dovecot on CentOS 7. Everything is working good when I try to send / recieve emails from services like Outlook.. etc. However, there is a problem when I send an email from ...
1
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0answers
24 views

How can I reject mails coming from a fake domain or a fake user in a real domain?

I have an exchange server 2010 recently installed and I receive a test with 3 step to check the security of my server. below the test Check if my server receive from fake domain. Check if my server ...
0
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0answers
23 views

Account duplication happens when user id is created on active directory

We have a setup where my active directory is in sync with Google. My email domain is managed by Google. When there is a user account created in Active directory I see two accounts created for the user ...
1
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1answer
13 views

Forget forwarded emails delivery errors

I have problem with configuring Sendmail, I've read a lot of topics on the net about similar problems but I didn't found a good answer for this scenario. Main problem is that my server has poor ...
1
vote
1answer
25 views

Migrating from old mail seerver to new, error “Sender address rejected: User unknown in virtual mailbox table” [closed]

I'm trying to migrate a domain from an old mail server to iRedMail, anyway I think the topic is more broadly Postfix specific. I have set up a new server based on iredmail and then I will migrate all ...
0
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1answer
30 views

How do I filter Exchange 2013 new-moverequest by “StatusDetail”

I am trying to make a report of "interesting" moves, errored, lagged, or slow. I'm starting with this Get-MoveRequest -ResultSize unlimited | where {$_.status -ne "Completed" -and ( ( ...
0
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1answer
43 views

Why mail.log is not logging to file? [duplicate]

my server yesterday started sending thousands of spam emails. I blocked it adding default_transport=No transport to the postfix main.cf. But now of course I can't send legit emails as well. I have ...
2
votes
1answer
105 views

Reverse DNS is not a valid Hostname error from MXToolBox

I can't send email messages from my server. However, I can receive email messages. I set up my server the exact same way I did many times which I've proven it works and it's pretty straightforward and ...
0
votes
1answer
27 views

Mail Delivery Failure - Reason: 571 Delivery not authorized, message refused

Good Morning, We have changed our external IP Address of our mail server earlier this week and ever since we are getting bounce backs from email addresses we can normally send to. One of the error ...
0
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1answer
43 views

Sending mail from perl applications with SSMTP

I am on host-server with Centos 7 and KVM virtualization. I have 2 guest systems which are in routed virtual LAN. One of them is WEB server, the other is a mail server. Web server has hostname ...
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votes
2answers
51 views

Setting up Google mail server on custom domain

I'd like to use Gmail for Work for my own domain and I have troubles setting it up. So, before that in my DNS config I had an "A" record (mail.example.com), pointing to the email server I used. Now, ...
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votes
1answer
41 views

In postfix, how to deny a specific email address from sending e-mail but still allow receiving?

The closest thing I tried was to add reject_unlisted_sender to main.conf but that also disables receiving any email to that mailbox. I want only deny sending but still allow receiving. EDIT Here's ...
0
votes
2answers
36 views

Is this a user/pass connection or an email communication connection?

I have lines like these in /var/log/messages: Jul 12 01:26:00 h2 xinetd[1596]: START: smtp pid=11253 from=::ffff:221.219.213.54 I need to know if that is an email connection like the ones being made ...
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votes
1answer
44 views

Change MX record to another server

I have a host-machine with Centos 7 and a guest machine with Centos 6.6. I want my guest to be a mail server on dedicated static ip for all my domains (on the same host-ip and not). P.S. I use ...
0
votes
1answer
32 views

email not being delivered for one account

I have setup a mail-in-a-box recently and it works fine for the main domain - it delivers and receives email just fine. I wanted to add another domain, so I followed the same steps [change DNS, setup ...
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votes
0answers
21 views

What's the port I should open to receive email in a server? [duplicate]

I installed Postfix in a Virtual Machine (managed bt Qstack). What's the port I should open to receive email messages? I want to forward email to other domains trough virtual_alias_domains / ...
-1
votes
1answer
47 views

setup postfix SMTP on amazon ec2

Im trying to setup a postfix SMTP mail server on my amazon ec2 instance. I followed this guide http://cybart.com/how-to-install-and-configure-postfix-on-amazon-ec2/ and many others I found which ...
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votes
0answers
12 views

subdomains and SPF failures

I have recently moved some of my e-mail services to sub-domains (sub1.company.com, sub2.company.com) because the SPF of the main domain - company.com got full (lot's of includes and there is more ...
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0answers
22 views

Alter all outgoing email to add return-path to it (Qmail or Postfix) [duplicate]

Is there a way (config option or program, script, etc) that can filter all outgoing email in order to add a return-path to each message sent from that server ? I would need it for eider Qmail or ...
1
vote
1answer
35 views

Dovecot - Fatal: execv(/usr/lib/dovecot/imap-login) failed: Permission denied

I'm in the process of trying to set my own mail server reasonably closely following this guide: http://sealedabstract.com/code/nsa-proof-your-e-mail-in-2-hours/ I've just started to test the ...
0
votes
1answer
33 views

Connection refused by [127.0.0.1]

I am not very good with email servers. Here is what I need: I have a mailbox at fastmail.com with my custom domain (let's call it example.com). Now I want to set up my web server to relay emails ...
1
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1answer
22 views

Is “QUEUE=” in /etc/sysconfig/sendmail the same as the “-q” switch in sendmail?

CentOS 5.x, SendMail 8.14.4 My Sendmail server is currently configured to retry deferred messages every hour. In /etc/sysconfig/sendmail I have the following: DAEMON=yes QUEUE=1h I don't see ...
1
vote
2answers
34 views

Is smart hosting to an A record a violation of RFC-5321 section 1?

I have a sendmail server configured to smarthost to a downstream resource. The configuration is currently: define(`SMART_HOST',`relay:[vip.example.local]')dnl Since it's sending the A record for ...
0
votes
1answer
16 views

What is the correct way to configure the SendMail SMART_HOST option to perform MX lookups?

I think this question is related to this post but I feel that it's different enough to warrant a separate post. I currently have my Sendmail server configured to send to a downstream VIP. In my ...
0
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1answer
24 views

What might be using my smtp port on a new CentOS machine?

I'm trying to setup a simple email server using node smtp-server. I'm the only one that's ever accessed the machine (a CentOS 6.5 box on Digital Ocean), and I've only set up 2 http servers. I'm ...
1
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0answers
8 views

Is DMARC helpful to me if I don't need reporting?

I have SPF and DKIM setup and working for the email domain I administer. The next recommended step is to setup DMARC since SPF and DKIM are both in place. What are the benefits of using DMARC if both ...
0
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1answer
48 views

Logwatch postfix report. Where does this “Deferrals” come from and how to stop it?

I'm using logwatch to monitor the logs on my server and I'm trying to make sense out of the postfix report. (See the report below.) By looking at /var/log/mail.log I saw that this mail seems to be ...
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votes
2answers
107 views

Dovecot is not working [closed]

I'm having a server. The server information I've given below. Linux host.com 2.6.32-531.29.2.lve1.3.11.1.el6.x86_64 #1 SMP Thu Dec 18 06:49:17 EST 2014 x86_64 x86_64 x86_64 GNU/Linux When I was ...
0
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0answers
46 views

Postfix Clogging Up

I have an OS X mail server running using server.app. In the background, it runs Postfix. Recently, my mail queue has been clogging up and I'm not quite sure why. I'll try to force the queue with sudo ...
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votes
1answer
38 views

Seperate web/mail server, mailserver won't receive emails [closed]

I have a basic set up: VPS Mailserver Domain Management This is my first experience setting up both a VPS and a separate mail server. My mail server won't receive emails. DNS A ...
4
votes
1answer
44 views

Why is sendmail adding an extra carriage return in headers?

I've got SendMail 8.14.4 running on a CentOS 5 server. A user in Japan is sending a message and when it gets processed by the server, SendMail is adding an extra carriage return for some reason. ...
-1
votes
1answer
139 views

Dovecot-core fails to start

I am attempting to follow this tutorial: https://www.digitalocean.com/community/tutorials/how-to-configure-a-mail-server-using-postfix-dovecot-mysql-and-spamassassin I believe someone before me ...
1
vote
1answer
32 views

exim: How to reject spam mail depending on destination domain

Currently, I have exim set up to mark spam mail, and reject spam mail with high scores, using these ACL instructions in the acl_smtp_data ACL: warn condition = ${if ...
0
votes
0answers
10 views

hmailserver not receiving any email

I followed all setup instructions and also probable know issues page but nothing helps. I have checked that hmailserver has a correct public hostname same as found in the mxrecord within our ...
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votes
1answer
39 views

Email Going Missing

I've setup Postfix for email delivery on a client's server and made sure that our PTR records, SPF, and reverse DNS is all configured correctly. As far as I can tell, we're doing everything correctly ...
1
vote
3answers
81 views

How much overhead does having infinite email aliases cause on the email server?

I was wondering if allowing users to have infinite number of email aliases have much overhead on the email server. For example, my mail email address could be vlad@vladmail.com but I could also use ...
0
votes
1answer
65 views

Fixing invalid DNS records for mail server with SSL certificate

Ok, so the question name is a bit weird but I wasn't quite sure how to word it. I have a machine with the hostname foo.example.com with an SSL certificate for the domain mail.example.com. I have also ...
0
votes
1answer
32 views

Sendmail sends unsolicited emails [duplicate]

I have a problem with sendmail. All of the sudden it started sending emails that its not supposed to send (obviaou spam messages about viagra, porn etc.). I checked some tools that supposedly check ...
1
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0answers
33 views

Exim Email hacked or Backscatter attack

I have undertaken an Exim Server for a client, this morning I Woke up to about 100 bounce backs from Hotmail with the following: "Undelivered Mail Returned to Sender" Googling I have come across ...
1
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0answers
21 views

Mail Server Memory buffer error

From time to time, my mail server stops sending any new mails. When this happened, I find the below error log, Jun 22 23:10:18 myserver saslauthd[3967]: DEBUG: auth_pam: pam_authenticate failed: ...
0
votes
1answer
41 views

Sending an email to multiple recipients via a mail relay, while hiding the recipients

Our software sends emails using Exchange. Typically each email foes to multiple recipients and we just send one email with multiple "to" addresses. We're moving to an SMTP-based email relay, where we ...
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votes
1answer
43 views

Is it possible to make me send an email by opening a malicious email? [closed]

I know I don't have much info on this problem/question so I will delete if everyone downvotes or votes to close/delete. Is it possible for someone to make an email look like I sent it simply by me ...
0
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1answer
84 views

How to add allowed relay IPs for Windows SMTP using command line or script

I have a long list of IP addresses I need to add as allowed relays to the built-in SMTP service on Windows Server 2008 R2 (IIS 7.5, but SMTP uses the old IIS 6.0 manager) I know how to add allowed ...
0
votes
1answer
32 views

Postfix dynamically set Relay Host [duplicate]

Does anyone know of a way to dynamically set the relay host when sending mail through Postfix? At what point does Postfix set the relay host? Is there some way that I can tell Postfix to use a relay ...