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

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72 views

How to BCC copy all outgoing emails with Postfix?

I have a VPS on DigitalOcean where I have installed Postfix. I'd like to add in BCC an email address of my choice for all the emails that passing through Postfix go to email addresses not in my system....
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2answers
45 views

Postfix Catchall - Avoid Spam

I've 2 accounts on my CentOS server configured with catchall email accounts. Lately I've been receiving bounced emails with virus that were supposedly sent from my server account, Ex: somestragename@...
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2answers
36 views

Service to test outgoing mail for SPF/DKIM/SRS validity?

We're setting up a redirection-based mail server with a lot of complex moving parts, including the standard ones that apply to everyone like SPF/TLS as well as the more complex ones needed to ensure ...
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1answer
21 views

Telnet times out on local machine but works externally

Im trying to get inbound mail working with postfix. Nothing is showing up, even in the maillog. Outbound works perfectly, but inbound doesnt. If i use telnet from an external server over port 25, i ...
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1answer
18 views

Mapping of Exchange error codes to SMTP status codes

Exchange error codes use a dotted notation x.y.z, for example 4.3.1 is an "Insufficient system resources" message. Is there a 1:1 mapping between this and SMTP error codes without dots (431) and if so ...
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1answer
112 views

Trying to setup mail server, can't get ports (25, 587) to work

I've searched everywhere and I'm really struggling with this one. I think I've tried just about everything. Background info VPS with CentOS 6.7 Postfix 2.6.6 dovecot, amavis, mysql, fail2ban I've ...
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0answers
12 views

Simple cross platform way to archive selected emails

We are a small NGO with its members using a various email-clients on various operating systems. We have the requirement to archive all external mails to and from a selected set of partners and ...
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7 views

Software to send all mails to external script with exim and dovecot

I am using exim and dovecot, and i have used roundcubemail for reading and sending. Now i need solution to create api for sending mails via php and smpt, and solution to forward all incoming mails to ...
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32 views

Postfix Not Sending Or Receiving Emails

I followed this tutorial to setup a mailserver on my centos VPS: https://www.linode.com/docs/email/postfix/email-with-postfix-dovecot-and-mysql-on-centos-6 And I am able to send emails to my account (...
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1answer
39 views

Fail2ban not respecting email settings

In Fail2ban I have set up my email settings as: # Destination email address used solely for the interpolations in # jail.{conf,local} configuration files. destemail = me@hotmail.com # # Name of the ...
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1answer
41 views

Postfix: Alias from multiple adresses to one

I've installed a postfix/dovecot combination on my VPS the last days and everything works fine. Now I want to add mail forwarding, so that mails with a specific suffix, like this: youtube-account@...
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4answers
77 views

SPF, CloudFlare, Google Apps - Email sent through Contact Form marked as spam

One of the main reasons of putting your server behind CloudFlare is to hide your server's IP address so an attacker can't DDoS your IP and render CloudFlare obsolete. By putting your server behind ...
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1answer
25 views

How do I specify the hostname SPF shows to users?

I have a production Magento site which is on a dedicated host. The machine has it's "hosting" name, host-123.hosting.com, as well as its public name, buystuffhere.com. DNS has been configured for ...
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0answers
16 views

Email issue not going to rediffmail. However - email going to other account and email been received by rediff from other accounts

I have recently migrated server Initially there was a problem in sending email to rediffmail due to Helo issue. It was rectified through PTR set up Emails were going Now am finding a new issue in ...
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1answer
42 views

What exactly does “probable open proxy: command=POST” mean in sendmail logs?

I noticed the following in my sendmail logs: May 11 11:11:16 foobox sendmail[21111]: uADEFHG21111: [1.1.1.1]: probable open proxy: command=POST http://foo2.example.com May 11 11:11:16 foobox ...
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1answer
46 views

Mutt suddenly stopped sending emails with attachments via Postfix

Issue arose when an attachment froze at the send stage (after uploading fine) in mutt 1.5.24. I updated to mutt 1.6.1, same compile flags, but still didn't send. Tested in Thunderbird (icedove) and it ...
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1answer
59 views

%CPU at 99% when cronjob runs php script every minute

I am using a debian server and for some reason when I run this php script using crontab every minute it says that I am using 99% of the %CPU with the php command (in the cronjob the command is php) ...
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1answer
79 views

How to set up an SMTP Relay Server

I have 2 servers (X and Y) and an SMTP server for sending emails. X needs to send an email using the SMTP server, however it cannot resolve the host for the SMTP server. This is inevitable and I need ...
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1answer
35 views

Cron jobs not sending mail - Solaris 11

I need some assistance please. I've written several scripts which runs on a cron schedule as root in Solaris 11.3. When I run these scripts manually I receive the mailx mails. But when the scripts ...
0
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1answer
63 views

Why is my mail blocked by Gmail (Marked as spam)

Three days ago I have installed CentOS with Directadmin what I've received from TransIP. The mailserver is now working, configured DKIM, SPF, DMARC etc. There is only one problem... mailproviders ...
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3answers
31 views

Email for domain vs subdomain at two different locations [duplicate]

I would like to know if I have a domain foo.bar and want to host the main email server at other provider, such as by google, simultaneously having another email server subdomain.foo.bar locally. In ...
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1answer
39 views

Protecting Distribution Groups [closed]

Problem A number of our AD distribution groups have recently been receiving spam from outside our network. These distribution groups are open to receive mails from outside of our network as we work ...
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0answers
38 views

Exim restrict send emails only from predefined list of emails

I use Exim MTA. I need to restrict hosting (lamp) send emails only from predefined list "From:" emails per user to prevent massive spam if website was hacked. Users use php to send emails via builtin ...
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1answer
31 views

The greeting from an IMAP server — format?

I'm trying to understand the specification of IMAP found at INTERNET MESSAGE ACCESS PROTOCOL - VERSION 4rev1 (RFC3501) Does the greeting from a server always have the following format? * OK ...
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0answers
66 views

Use postfix through a proxy. How should it be configured?

Postfix by default uses ports 25, 465 and 587. In my configuration, I enabled TLS encryption using the option smtpd_use_tls=yes in postfix's main.cf. This makes all smtp communications encrypted as ...
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1answer
62 views

Sync a Maildir backup to an account

I have a client who created about 20 mailboxes on a server, and they have been using them for a few weeks. So there is mail in them, that can't be lost. Now they recovered a backup of those mailboxes ...
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3answers
106 views

Is it possible to reject certain emails in procmail? [In SMTP session rejects based on email content]

Let's assume a typical setup where procmail is called from sendmail to filter incoming emails into correct mailboxes. Is that done while the incoming SMTP connection to sendmail is still active or is ...
3
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1answer
65 views

Logwatch is not respecting MailFrom

I've gone through today to setup Logwatch on my server and have installed this all successfully. I've followed this guide on Digital Ocean and set the MailFrom parameter to: MailFrom = mailer@...
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0answers
9 views

What's a reproductable way to set up a Linux server for sending e-mails but no spam? [duplicate]

I've created a software that has to be installed onto a Linux server and from time to time it has to send a notification email. So, for people who want to use my software, I've created a bash script ...
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0answers
38 views

changing dovecot/ispconfig mail user password via mysql prompt

I want to change mail user pass of a dovecot/ispconfig system via mysql prompt. I was using a script with the following query in another machine (just dovecot) : UPDATE mailserver.virtual_users ...
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1answer
61 views

Set PostFix relay_host only for outgoing emails

I setup an architecture with a PostFix mail server and an Encryption gateway. I am relaying all my outgoing SMTP traffic (even mails going from mydomain.com to mydomain.com) to an encryption Gateway ...
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1answer
12 views

OSX Server - Logging POP Mail Connections

I am trying to keep a running record of the users that are accessing our OSX 10.6.8 Mail Server using POP instead of IMAP. The Server Admin application features a running list of Mail connections ...
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2answers
45 views

Should a mail server receive mail at the hostname or just the domain?

When configuring a mail server, should it be setup to receive mail at the hostname or just the domain? For example, if the hostname of the mail server is sub.domain.tld, should mail from anywhere be ...
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0answers
25 views

Enterprise batch processing of application-generated emails

Here is what I perceive is our problem. In our corporate environment, we have developed over 40 custom .Net applications (and growing). A good many of these send email notifications in some fashion. ...
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1answer
215 views

SMTP: Received from unknown [xxx.xxx.xxx.xxx] -> but IP does have a valid PTR/RDNS

I got the following problem. I got an smtp-relayserver that collects outgoing mails from other servers and checks them (spam assassin). Now the headers are showing this: Received: from ...
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1answer
37 views

linux: forward mail in mailbox

Is it possible to forward mail out of a mailbox to another mailbox? I know about .forward, that's not what I want to do(seems like that's 100% of the answers out there). I already have mail in a ...
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0answers
5 views

Gmail relay server not working from one sender 550-5.7.1 [duplicate]

I've got a postfix server set up to relay emails sent to my personal domain to a gmail account. It's been working fine for everything until today when a sender reported that all their emails are being ...
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2answers
107 views

Secure Email Settings for Email Clients & for PHPMailer

I'm trying to work out how to make my outgoing/incoming email's as secure as I can possibly make them. First of all, my domain has Wildcard OV SSL Certificates, I have copies of the .csr, .crt and ....
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3answers
84 views

Setting up an email proxy server?

So i have 4 application servers and each one directly connects to an SMTP server to send out the emails. What I want is to have something in the middle that my servers connect through instead, and ...
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0answers
73 views

Postfix relayhost not working

I have a simple goal: I am setting up a monitoring system and I want this monitoring system to send me emails when a problem with my servers occurs. I have Postfix installed. And I want to use mail, ...
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0answers
52 views

Opencart: can't send email only to gmail [closed]

Recently i've been working on a opencart based website, everything works just fine, the only thing it doens't work fine is the emailing system. If i use a hotmail account to register everything will ...
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1answer
125 views

Number of issues with postfix, DKIM, and mail getting rejected or bulked

I'm having a number of issues with Postfix and mail sent being rejected or put in the spam/junk folder. I am trying to send emails on behalf of a number of my customers. I've got a postfix server set ...
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1answer
72 views

Undelivered Mail Returned to Sender

How can i fix this. From: MAILER-DAEMON@adam.yocta.com (Mail Delivery System) Date: 26 April 2016 at 5:50:23 PM GMT+4 To: contactus@immunity.ae Subject: Undelivered Mail Returned to Sender This is ...
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1answer
67 views

Exchange server 2016 Content Filtering

I have setup an exchange server on premise with at SMTP Relay on our VPS. It works very well, unfortunately I’m a little confused as to where I setup the various permissions for SPAM. All my incoming ...
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1answer
160 views

Using TLS in email sending

I've configured my server (Exim on Debian Linux) to send emails (with SMTP) only to email servers which accept TLS. I did this so that nobody can steal a password reminder email. Right decision? Do ...
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1answer
83 views

Sending mails from Gmail through my VPS (postfix, dovecot, postfixadmin)

This problem has been bugging me for a long time now and i want it to be fixed. On my VPS I have set up Postfix working correctly with postfixadmin and dovecot. (I can send (by terminal) and receive ...
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1answer
60 views

exim4 issues sending mail to gmail

I am trying to send automated emails from my server to my gmail account, so that I can get important notices like when my webserver is not responding, or just some daily statistics. As email sending ...
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1answer
32 views

Can I prevent users from loading images in emails (disable “re-enable the blocked features”)

Using only Office 365 with no onsite AD or exchange infrastructure. Can I push out a policy or something to online and local installations of outlook to control whether images are automatically ...
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2answers
55 views

Bulk emails - what to do with “over quota / mailbox full” undeliverable emails?

We send out newsletters / bulk mail (double opt-in of course). We automatically delete hard bounces (mailbox unavailable, user unknown, host unknown...) right away from our mailing lists. But a lot ...
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1answer
27 views

Is this considered as spam email generated by postfix?

I have just checked my email log at /var/log/mail.log Apr 22 22:09:02 server2 postfix/pickup[14310]: D1FCF737C5B0B: uid=0 from=<root> Apr 22 22:09:02 server2 postfix/cleanup[17071]: ...