Tagged Questions

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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-2
votes
2answers
76 views

Do I need SMTP when using Postfix/Dovecot? [closed]

I have setup Postfix and Dovecot. Microsoft outlook tells me it cannot find the SMTP server. I thought dovecot would handle all the deliveries? Do I need to allow postfix to listen to external ...
0
votes
0answers
87 views

migrating to new server, would like to keep sending email from existing server

Hello I'm in the process of moving my site to a new host (ie new IP). I run a social site that sends a large volume of (valid) email, and I have built up a good sending reputation with my current IP ...
1
vote
2answers
52 views

Postfix sending and receiving in strange way.

I have an email server, running on CentOS 6.5, 32bit system, with Postfix and Dovecot running along all their dependencies. Let's assume my domain is www.anw.com I have created A record in this ...
1
vote
1answer
66 views

exim4 redirect router, fallback if redirected delivery fails

I run an exim4 instance that is the primary MX for my domain and receives email from the public Internet. Mail for my users is forwarded on to other email addresses - I use the redirect router and ...
-1
votes
2answers
41 views

Handling emails in a separet email servers [closed]

This is a problem about maintaining an all-email VPS server. First, I have two VPS hosts right now, both running CentOS 6.5, 32bit system. one for web hosting and other for email only. The reason ...
0
votes
0answers
27 views

Courier custom queuetime (bounce time) for some mails

I have a customer that wants me to deliver email on their behalf. The customer wishes for our MTA (Courier) to stop attempting delivery and bounce an email after one day. I am to deliver to the ...
0
votes
1answer
44 views

How I can set the errors in spanish language on postfix server email?

I have a postfix servers in my network and very much users not read the english lenguage, and I want set the errors in spanish language. My version of postfix email servers is: mail_version = 2.9.6 ...
-2
votes
1answer
874 views

Multiple mail servers for a single domain [closed]

Running a "DNS scan" to make sure my DNS zones are setup "correctly" led to the suggestion by the tool to run more than one mail server for redundancy. It got me thinking about how one would implement ...
0
votes
1answer
26 views

postfix multiple recipients for the one address

I'm running postfix on centos and in my /etc/postfix/address I have email@domain.com username which works and now I want two people to be on that list now. I've tried email@domain.com username, ...
0
votes
1answer
22 views

Redirecting emails based on alias to different mail server/store

We are a pretty small startup which is involved with providing mail services as part of the portfolio. Up to now, all our C-level officer's emails have been going through our own mail server product ...
0
votes
1answer
125 views

Setting MX entries for Failover [closed]

I have a GoDaddy domain as "example.com". I wanted to have my own DNS server for the sub domain secure.example.com. So I added a "A" record "NS" pointing to my IP and a NS record "Secure" pointed to ...
-2
votes
1answer
42 views

Removing non-0 priority MX records

I have MX records set up as such: 0: domain.com (runs of the webhost, really bad) 1: GOOGLE ... google I somehow accidentally added the Google Apps mx servers, btu didn't change the priority 0 ...
0
votes
1answer
122 views

Attack from strange IP address, how to block?

Looking through the mail logs I've noticed a lot of these: Apr 7 11:33:25 s123456 pop3d: IMAP connect from @ [::ffff:192.96.206.9]checkmailpasswd: FAILED: web14p3 - short names not allowed from @ ...
1
vote
2answers
248 views

How to incrementally migrate email accounts from qmail server to exchange server

The scenario is I need to migrate mailboxes from a qmail server to exchange server. I can use imapsync for that. But the issue is after the DNS change (i.e when DNS changed from old qmail server to ...
1
vote
1answer
206 views

Spf passes or fails depending on receiver address

I have postfix with dovecot set up on Ubuntu 13.10. I send emails via a node application (using email-templates). If I send an email from noreply@mydomain.com to myacccount@gmail.com (email 1), the ...
0
votes
1answer
51 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.
0
votes
1answer
180 views

Mail Server with different IP than Web Server [closed]

I recently had a problem. Somebody hacked a Wordpress Site of one of my customers and sent about 70.000 Spam Emails. So my Server IP got blacklisted on some Providers. I'm looking now for a solution ...
0
votes
1answer
64 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 ...
-1
votes
1answer
36 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. ...
0
votes
1answer
29 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 ...
0
votes
1answer
257 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; ...
0
votes
1answer
968 views

Disable Cipher SSL3_RSA_WITH_SEED_SHA in Postfix

I want to disable cipher SSL3_RSA_WITH_SEED_SHA in Postfix. I have got in main.cf smtpd_tls_ciphers = high smtpd_tls_protocols = TLSv1,!SSLv2,!SSLv3 smtpd_tls_exclude_ciphers = aNULL, DES, 3DES, ...
0
votes
2answers
838 views

Mailserver and MX records in Cloudflare

I built my own mail server using postfix/dovecot in CentOS 6, this is my postconf -n results: alias_database = hash:/etc/aliases alias_maps = hash:/etc/aliases command_directory = /usr/sbin ...
0
votes
2answers
106 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 ...
0
votes
0answers
32 views

Virtual and system mailboxes - how to set passdb propperly

I've just configured email on my server. Gentoo, Postfix, Dovecot, Amavisd, ClamAV and Spamassasin I am using LMTP for delivering virtual mails, works great. I am using standard postfix deliver ...
0
votes
2answers
129 views

Gmail as stand-by mail server for Exchange for incoming emails

How to configure MX zones to utilize Gmail/Outlook as stand-by incoming mail server with my active Exchane to provide reliability? Gmail/Outlook should only be used in case of Exchange is ...
1
vote
0answers
131 views

Postfix configuration with DKIM to send mail from multiple domains [duplicate]

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, ...
0
votes
1answer
105 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 ...
1
vote
1answer
27 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 ...
1
vote
1answer
91 views

Where do I add DKIM details to amavisd.conf on Ubuntu?

I'm trying to add a DKIM key to an additional domain on my Ubuntu mail server, I am trying to add the following block of code to the amavisd.conf file $enable_dkim_verification = 1; ...
-1
votes
1answer
1k views

Unable to connect to GMail SMTP server [closed]

I'd like to send some emails with my gmail account and nodemailer. Locally, it works fine, but not in my server. $ telnet smtp.gmail.com 465 Trying 74.125.29.108... Trying 74.125.29.109... Trying ...
1
vote
1answer
60 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 ...
0
votes
2answers
284 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 ...
0
votes
1answer
90 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 ...
1
vote
1answer
116 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 ...
1
vote
1answer
118 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 ...
0
votes
0answers
107 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 ...
0
votes
2answers
595 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 ...
0
votes
1answer
114 views

PHP Forms - Web Hosting and Mail Hosting on Different Servers

I used to have a website with GoDaddy but wasnt happy with their service, so I transferred my website to a new host but kept my domain and emails with GoDaddy. Basically i changed the A ...
0
votes
1answer
1k 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 ...
1
vote
0answers
81 views

Debian exim4 rate limits

I try to limit on exim4 the outgoing mails per day per domain, i found this: acl_check_ratelimit: accept authenticated = * endpass ratelimit = 40 / 1d / per_rcpt / ...
0
votes
1answer
99 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 ...
1
vote
1answer
662 views

Dovecot creates folder, Postfix expects file

I have tried configuring a Postfix/Dovecot combo with virtual users using this guide. My server is running Postfix 2.6.6 and Dovecot 2.0.9 on CentOS 6.5. The problem is that when I connect to the ...
0
votes
1answer
63 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 ...
0
votes
1answer
63 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 ...
0
votes
2answers
1k 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 ...
0
votes
1answer
615 views

Having Trouble Setting Up CentOS Email Server

I'm having some trouble setting up a mail server on CentOS, as of right now, nothing is getting sent at all and I'm not entirely sure why, I've tried a few guides, but none of them seem to explain ...
4
votes
1answer
72 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 ...
3
votes
2answers
1k 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 ...
0
votes
1answer
125 views

Limit maximum number of destination addresses

One of my clients sends e-mails from time to time that are categorized as spam due to the large number of destination addresses used in the "To" field. The problem is that it does this very often ...