1
vote
1answer
58 views

What happens inbetween SMTP and POP3?

I understand SMTP, and to a lesser degree POP3, but I feel like I'm missing a large chunk inbetween. I see this image on a Microsoft page: and I feel like what I'm missing is the "Internet" part. ...
-5
votes
1answer
92 views

How to setup SMTP server to allow mailing to any recipient? [closed]

I have a windows server, acting as a web server and mail server. For the mailserver I use hmailserver and works fine recieving emails but not so good sending emails because I cannot setup reverse DNS ...
0
votes
1answer
48 views

Postfix virtual mailbox base, uid, gid — good user and group choice?

I often see tutorials for setting up Postfix with the virtual mailbox delivery agent on Linux that instruct to create a new disabled-login user and group to own virtual mailboxes in ...
1
vote
1answer
60 views

Postfix 5.7.1 Unable to relay [deliver internal mail directly]

I have the following scenario: serverA = RHEL5 using Sendmail serverB = RHEL6 using Postfix serverC = RHEL6 using Postfix gwsmtp = relayhost example.com = domain name As we are migrating from ...
0
votes
0answers
35 views

Server sometimes doesn't receives e-mail, with error 451

One of my customers tried to send me an e-mail with his e-mail address that I didn't received. He received a Delivery Status Notification (Delay). I only received the message 2 days later In the ...
-1
votes
1answer
101 views

My server does not listen to port 25, even though iptables allows smtp traffic [closed]

My public server accepts traffic and relays them to other machines on the network with iptables PREROUTING rules. I recently added a mail server at 192.168.1.10 and made its iptables rules to accept ...
1
vote
2answers
56 views

Simplest Way to Setup Email for Various Domains

I'm beginning to use Mandrill to send out transactional emails from my various domains. Now what I'd like is a way to receive these emails simply w/out setting up a mail server on my linux boxes. I'm ...
0
votes
2answers
79 views

What should I set in postfix's myhostname / mydestination?

I am using Ubuntu, on a web server need to send out email (via sendgrid), this server never receive any external email, and I've the following hostname settings /etc/hostname = example /etc/hosts = ...
1
vote
1answer
121 views

Have Postfix bounce certain addresses with a custom message and forward all other messages to another server

We have a list of users who no longer have mailboxes in our Exchange environment. We want to have a very specific reply to these users with a possible custom variable. I thought Postfix would ...
2
votes
1answer
49 views

Maximum length of MAIL FROM address

When sending out emails with a MAIL FROM address > 81 characters I receive bounce messages from some MTAs: 501 Syntax error - Badly formatted address. (in reply to MAIL FROM command) As soon as ...
1
vote
1answer
81 views

Overriding selected recipients using postfix

Is it possible to have some kind of regex match and replace, like it is possible for outgoing mails for incoming, too? I am already able to replace the from field for outgoings, by using the ...
-2
votes
2answers
66 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
61 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 ...
0
votes
1answer
80 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 ...
0
votes
1answer
75 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
96 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 ...
0
votes
2answers
227 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
87 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 ...
0
votes
1answer
49 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
0answers
106 views

Undeliverable SMTP email not saved to badmail folder using IIS6.0

I am testing my SMTP virtual server hosted in IIS6.0 to verify that when an email cant be delivered and cant be sent back to the sender, then I need to see a copy of the Non Deliver Report in the ...
0
votes
2answers
280 views

Domino always server fails to send SMTP email at first attempt

In our logs, we find the below: Router: No messages transferred to fakedomain.com (host mx.fakedomain.com) via SMTP: The server is not responding. The server may be down or you may be experiencing ...
6
votes
1answer
122 views

Should I listen for SMTP on both 25 and 587?

I was setting up haraka as our mailing server, and for outbound email, it suggests moving to port 587 for SMTPS auth support. However, I'm unsure if I should be running 2 instances of haraka on ...
0
votes
1answer
140 views

What do I need to be able to send mass SMTP email efficiently? [closed]

I am creating a web application that allows users to send broadcast emails to a list of subscribers. Essentially, it's a mass emailer and autoresponder, like AWeber or Constant Contact or MailChimp. ...
2
votes
1answer
82 views

Exim retry is Message based instead of host based? why

from what I understand exim retries are supposed to be HOST based, NOT message based. This seems to make sense to me; if a host's server is overloaded or otherwise telling you to "delay sending ...
0
votes
1answer
53 views

If one SMTP Server is down, routing all requests to another, how to achieve?

I have an application which uses e-mail notifications at many levels, so if an SMTP Server is down, I get in trouble. I can't switch the SMTP adress in all my configs fast, or lets say even don't want ...
0
votes
1answer
379 views

TLS connect failed: error:140943FC:SSL routines:SSL3_READ_BYTES:sslv3 alert bad record mac while sending mail via Qmail

I'm trying to send e-mail to one of the biggest polish hosting companies and their servers are refusing to receive it with message: TLS connect failed: error:140943FC:SSL ...
2
votes
2answers
54 views

Move Maildir safely on running server

I want to move some Mailbox directories to a new disk while postfix and courier imap daemons are still running. The question is ¿what happens if a new mail is recieved into the Mailbox while moving ...
5
votes
1answer
293 views

saslauthd multi instance for postfix smtp authentication

I have mail server Postfix+Saslauth. I configure multiple instance for Postfix: postfix postfix-out and two instances for saslauth: saslauthd saslauthd-out Setting saslauthd is ...
0
votes
3answers
153 views

SMTP sent E-mail not copied to Sent Folder [closed]

I discovered that some (few) providers don't copy into the Sent folder those E-mails which are sent from mail clients through SMTP. They only copy them to the sent folder if you send them from their ...
1
vote
1answer
136 views

Email server can send internal, but messages never arrive at external recipients

I'm running MailEnable on my server, and have been for many years. Recently we had an attack on our server, and I was able to close the hole. Since then, our mail server doesn't seem to be sending ...
2
votes
1answer
35 views

Translating return receipts and postmaster messages

I was wondering if it is possible to translate postmaster message (return receipts, notifications, etc), or at least customize them. I ask this because my users (too) often call me in order to know ...
0
votes
2answers
126 views

Same domain SMTP unauthenticated message relay [closed]

While I was doing some testing on an SMTP server I was able to successfully send mail from knownid@myserver.com to knownid@myserver.com through telnet without any authentication. From a risk ...
-1
votes
1answer
236 views

Can't connect mercury mail smtp server outside local network

I'm using Windows Server 2008 R2, and Xampp with mercury mail. My problem is that I can't send mails via my server outside the server network. My SMTP server is using port 25, which is open and ...
1
vote
0answers
89 views

Configure postfix to limit total number of connections from any and all SMTP clients in a given time period?

I am trying to figure how to configure Postfix to operate within the requirements given by Spamhaus for free usage of their DNSBLs (http://www.spamhaus.org/organization/dnsblusage/). They specify that ...
0
votes
1answer
280 views

OS X 10.4 Server SMTP Server timeout [duplicate]

I just set up my server today with one of my new static IP addresses to act as a mail and web server. The web server is working fine, and the mail server is working fine to receive mail, but I am ...
1
vote
1answer
522 views

PHPMailer script stopped working with cryptic SMTP error messages

I am trying to send mail in a PHP script via the PHPMailer library. The following code has successfully sent emails in the past without warnings: function mail_attachment($filename, $path, $mailto, ...
0
votes
0answers
408 views

lmtp: connect(backend) failed: Connection refused

A long time ago I'm trying to fix this error but I'm still locked, I appreciate any help :). I detail all that I have and what I am trying to do. I am using Cyrus Murder and apparently everything ...
0
votes
1answer
1k views

501 5.5.4 Invalid Email address when sending email in Outlook.com custom domain

I am trying to send a mail from my website through smtp.live.com port 587. I verified the credentials and even tried to send the email from Gmail by adding the account there and sending through it. On ...
0
votes
0answers
342 views

How to drop messages containing a specific text from exim4?

I am trying to filter messages received by exim4 on Debian by using a system_filter but for some reason exim4 keeps delivering them even if I know that the filter is loaded but the conditions are ...
0
votes
1answer
83 views

Email delivery to a user name that is a long hex string

One of my mail servers (postfix if it matters) has been target of what seems to me to be an attack. The attacker tries to deliver messages to a non-existent user formed as a long hex string with SMTP ...
1
vote
1answer
840 views

Enabling Basic Authentication on Exchange 2010 SP1

Firstly, I know nothing about how exchange operates and what is and isn't possible. We're trying to send mail from our webserver (AWS) through our own mail server(In house) but for this we need an ...
0
votes
1answer
9k views

Postfix Temporary lookup failure

I am trying to set up postfix, but I get a "Temporary lookup failure" error main.cf: inet_protocols = ipv4 inet_interfaces = all queue_directory = /var/spool/postfix command_directory = /usr/sbin ...
0
votes
2answers
106 views

SMTP server to smtp server forwarding?

we have one smtp server and we want incoming mail should store by smtp and forward two other smtp server is their any solution we dont want email forwarding Ex mail@mail.com to amail@mail.com ...
0
votes
2answers
114 views

Thousands of port 25 connections

Tonight a few IP addresses made almost 2500 connections on port 25 of a mail server. 2500 is the max limit, and 50 or less simultaneous connections is normal. They did nothing once they made the ...
4
votes
1answer
120 views

Simple, forwarding-only MTA?

I have a domain and a server. I’d like to have some e-mail addresses on the domain and I’d like to forward them elsewhere. I’d love to avoid running a full-featured MTA on the server, since they’re ...
0
votes
1answer
288 views

SMTP Authentication issue on a postfix/dovecot setup

I have just setup my debian mailserver using postfix, dovecot and SASL as explained in this excellent tutorial. I have used postfixadmin to setup a virtual list of aliases for sending user@domain.com ...
0
votes
1answer
695 views

Google Apps + Mailgun Split Delivery

We currently use Google Apps for receiving emails on our domain. We would like to send all mail to unknown addresses to our Mailgun server for further processing. This seems like a typical "split ...
0
votes
0answers
537 views

Setting up Smartermail SMTP Banner for multiple IP / hostnames

I use Smartermail Enterprise 10.7 and I wonder how to set SMTP banner for my server which has 5 different IPs, each has its own PTR point to different domain. what cause the SMTP banner only match ...
0
votes
1answer
131 views

Receiving email to wildcard subdomain @ any alias (anyalias@*.domain.com)

I have seen lots of SaaS solutions provide client specific email URLs like the following: anyalias@*.mydomain.com. This is a new concept to me but i need to adopt it for future application ...
0
votes
1answer
114 views

PHP Server doesn't Receives Mails from Windows SMTP

I've got a strange problem I setup my SMTP server on windows server for my PHP IIS and I've been sending mails from there but while my gmail account receives this mail my PHP hosting server doesn't ...