SMTP is the Simple Mail Transfer Protocol, the most recent standard of which is defined in RFC 5321. It's the Internet standard for sending and receiving email.

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SMTP retry interval - Lotus Domino

Our ISP only accepts 5 emails per transmission. If I do a manual send (route *), then I usually get the error: 57 Retry( 2) SMTP [$Retry MY_ISP.COM] (Push) Last error: 421 4.4.2 Message submission ...
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2answers
21 views

SMTP don't work when try to send mail from mail clinet

Mail server works fine when send mail from server, but when I use some mail client it not work. I found this in logs: Jul 12 19:45:04 tvsite postfix/smtpd[3356]: warning: hostname adsl-bb29-l44 does ...
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1answer
27 views

EXIM - 550 Cannot receive from specified address - Sendgrid

We're having some intermediate issues with exim where some emails go through and then others get the 550 Cannot receive from specified address Error. This is the guide we used to setup EXIM: ...
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2answers
19 views

Remote IP and SMTP Proxy

Is it possible to proxy emails - with postfix for example - transparently so the backend mail server will get the last SMTP server IP address (rbl purpose) and not the Proxy IP address? If it is ...
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3answers
54 views

Will mailing lists “break” if SPF is too restrictive?

I have recently configured my own mail server (Linux-based postfix + dovecot scenario). This is just for personal use - I have no bulk mail going out, no automatically generated mail outbound from the ...
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2answers
37 views

View realtime list of connections to Postfix

I am running Postfix on a linux box with a couple hundred local users with mailboxes. Is there a way to monitor all incoming connections (SMTP) to the Postfix service? I.e. a live stream of "IP ...
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0answers
28 views

drop smtp live connection

So the problem is that I think my server got DDoS attack with SMTP packet (my mail server). What I can see is that the attacker abuse the smtp_connection_cache. The attacker keep connections (smtp) ...
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0answers
22 views

OpenSMTPD does not deliver mails to MX without TLS

My OpenSMTPD trys to deliver a mail, which i sent locally from the system. But it stops transmitting when tls is not available on the target mx. Jul 4 12:44:50 troll smtpd[4229]: smtp-out: ...
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1answer
18 views

smtpdiag tool lists wrong mail servers

I have a weird issue on a server. When i run the smtpdiag tool, it lists the old mail server settings (with mx servers being website.com & mx01.1and1.com). here're the results Checking MX servers ...
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0answers
23 views

How to test connection to Google mail server? [closed]

For example, google mx records for gmail is ALT1.ASPMX.L.GOOGLE.com I've tested all common smtp ports (25, 2525, 465, 587) and does not work. Any idea?
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4answers
142 views

Postfix setup on AWS EC2 using SMTP relay

On ec2 instance, the IP is dynamic, and if I want to use third party SMTP gateway such as sendgrid, what is the suggested values of the following fields? myorigin myhostname mydestination Assume ...
0
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1answer
21 views

RoundCube SSL SMTP Failure

I've set up a roundcube installation on my website that works great when using SSL for IMAP and non-ssl for smtp. The only problem is this: when I switch to using ssl://smtp.[mydomain].com for my ...
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2answers
68 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 = ...
0
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1answer
16 views

Regarding Remote SMTP

I am trying to send mail using remote Gmail SMTP from my joomla website. Do I still need to install & configure MTA such such postfix for connecting to remote Gmail Servers or the joomla would ...
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0answers
29 views

Exim/Cpanel Email Headers

We have been trying to figure this out for a few days now and have been all over this board as well as a few others, and this refers to Received From and X-AntiAbuse: Primary Hostname headers. We are ...
0
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1answer
23 views

Send email from main domain using exim4

I've installed exim4 on my server to send email for server messages, registration messages, lost password messages etc. My server's FQDN/rDNS is mail.example.com, which I also entered during the ...
2
votes
1answer
49 views

How can I enforce TLS in sendmail when I don't necessarily know the hostname of the downstream MTA (only IPs)? [e.g. by recipients' domain]

I'm running SendMail 8.14 and have some custom static routes for sending to certain domains. These domains are "internal" but not managed directly by me. Here's an example of ...
0
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1answer
24 views

how to provide username and password for ansible mail module

How to provide username and password of email account while using ansible mail module. I'm using gmail smtp server. In documentation of mail module nothing is mentioned about it. I also came across ...
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1answer
28 views

SecAst: Configuring Email Alerts for Google Apps Account

Requesting assistance with configuring SecAst email alerts to work with Google Apps hosted account (posting here as per request by Generation D)... We have SecAst installed on a system with a new ...
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0answers
23 views

What Is The Comment Syntax for SMTP Script

I have a simple test script for SMTP that looks like this: helo 192.168.1.1 MAIL FROM: <me@work.com> RCPT TO: <me@gmail.com> DATA FROM: "buck" <me@work.com> TO: "me at gmail" ...
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0answers
43 views

Unable to send mail after installing Postfix and Dovecot

I have setup a mail server with Postfix and Dovecot in my debian server. I can send and receive messages between my users using the 'mail' command: mail user@mydomain.es but i can't send mail using ...
1
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1answer
33 views

What are some useful email reports to monitor in an SMTP/email environment?

It's possible to generate dozens of email reports in a given SMTP environment, and I'm interested in learning what reports are common in large installations and how they are used. Examples: ...
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3answers
84 views

How to limit amount of email sent by postfix to certain domains and control it by using mail header?

Goal I'm looking for a solution to limit rate of e-mails sent to specific e-mail operator (several Top-Level domains, all of them I know) on hourly basis. I also need some way to control the rate on ...
1
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0answers
18 views

Exchange 2010 – Multiple Smart Hosts

A client has Exchange 2010 which, up to now, had a single internet connection. They were sending email via a smart host run by their ISP. It was working OK. We have put in a second internet ...
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5answers
58 views

Do most SMTP servers support SSL? [closed]

I'm working on an application that has to be able to send out emails with potentially sensitive information. I was wondering if there's any data on what SMTP servers are typically used in a corporate ...
0
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1answer
73 views

Postfix allow SASL-authenticated users to send from any IP address

I understand that I need SMTP on port 25 to receive email, but I do not want this to be a relay port. Instead I would port 587 to be used for registered (SASL-authenticated) users to relay email from ...
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1answer
95 views

Incoming hotmail connections timing out with TLS enabled

Okay, this has me completely baffled. I have tried many things to fix this but I'm at my wits end. At the start of June, the server which I maintain suddenly decided to stop accepting incoming TLS ...
0
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1answer
25 views

Postfix Regex Alias with Text Substitution

I'm migrating from an older email structure ([first letter of first name].[last name]@company.com) to [first letter of first name][last name]@company.com. To ensure that mail sent to older addresses ...
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0answers
13 views

Plesk qmail-smtpd: how to relay mail sent FROM a certain domain through a smarthost

Running Plesk with the default qmail-smtpd and would like to bounce mail sent from one large customer through a seprate smarthost. I did some searching and it seems you can only decide which mail to ...
0
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1answer
38 views

How to know if iptables rules work? [closed]

I'm implementing a IP Rotation for my SMTP Server using iptables, how would I know it work? This is the rule I use. iptables -t nat -I POSTROUTING -m state --state NEW -p tcp --dport 80 -o eth0 -m ...
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0answers
20 views

Configuring SMTPS in Virtualmin

I'm attempting to configure SMTPS in Virtualmin and am running into a roadblock. I followed the instructions here without a problem but when I do the autoconfigure in Thunderbird it still says that ...
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0answers
49 views

Zimbra SMTP Reverse DNS Mismatch

I have a Zimbra email server. sending and receiving is fine, however When I use online tools to check that things are configured properly, I'm being told my reverse DNS SMTP Banner is wrong. ---- ...
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1answer
62 views

Postfix After-Queue Content Filter, advanced filter not working

I followed the instructions in the postfix website on how to setup a content filter, I got the simple example up and running fairly quick, but after long hours of struggle I couldnt get the advanced ...
1
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1answer
58 views

Google IP Address Ranges for incoming SMTP

Essentially I'm answering my own question here, but want to provide this info to anyone else who might need it. I need all the valid IP address ranges for Google Apps mail servers. I'm configuring a ...
1
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1answer
50 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 ...
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2answers
69 views

Reverse DNS (PTR) for Email

We are hosting our website (http://www.redappleapartments.com) with a hosting company in Sweden. And we are using godaddy as our email provider. So, our smtp servers are smtp.europe.secureserver.net ...
2
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1answer
57 views

Postfix multiple checks

I want to achieve the following with Postfix: Run all emails through a black list Allow any clients sending to a list of domains Allow some clients sending to any domain This is what I have: ...
0
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1answer
41 views

Two servers, severals domains, reverse DNS and blacklist

I will try to explain the context. 2 VPS with PLESK 11.5 The first (named vps67877.ovh.net - we call it v67) is a mail server (ip 37.187.33.38) The second (named vps68789.ovh.net - we call it v68) ...
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0answers
50 views

Collectd notify_email Plugin Not Working On Ubuntu 14.04

I'm attempting to set up e-mail notifications using collectd and the threshold / notify_email plugins. I'm running Ubuntu 14.04 LTS, attempting to relay e-mails through Amazon SES. Relevant package ...
2
votes
1answer
80 views

5.7.1 SMTP error when running stored proc using DB Mail in SQL Server 2012

I am getting an error in SQL Server 2012 Database Mail when executing a stored proc to send an email from a specified address to a specified address using Office 365 as the SMTP server. The mail ...
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0answers
27 views

hMail server - sending copy of an e-mail changing the sender

Dear All please help me with following request. I am using hMail server in a company(test.com) and have several hundred of guest e-mail accounts (guestxxxx@test.com). I need to accomplish this: ...
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0answers
42 views

sSMTP Configuration issue for Zoho mail

I was using following configuration to send from Gmail from sSMTP from Ubuntu using PHP # # Config file for sSMTP sendmail # # The person who gets all mail for userids < 1000 # Make this empty to ...
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0answers
20 views

How to find the smtp connection of an organisational mail?

I am using alfresco 4.2e which uses smtp configuration to send mail. Here is my required configuration mail.host=smtp.gmail.com mail.port=465 mail.protocol=smtps mail.username=abc@gmail.com ...
0
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1answer
30 views

Exchange 2007 issue internet receive connector

I have issue with yahoo.co.uk if I send a mail from within the yahoo webconsole the mail arrives in my inbox on the exchange server If I send mail from Iphone configure to send via mail box ...
2
votes
1answer
34 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 ...
0
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1answer
37 views

Sendmail.mc: alias all incoming e-mails to one account

I need to alias all mail coming from another SMTP server to this one account "myinbox". The system in question is to receive all e-mail on the domain, if that's any help. ...
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1answer
41 views

SMTP Server setting on Windows 2008 R2

I am very very new to this and just trying to configure SMTP virtual server. I have followed a few threads to get it all running, but the mails are not being delivered. What I have done so far - 1) ...
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0answers
99 views

Email client wont connect to SMTP Authentication server

Im having trouble installing SMTH Auth for my ubuntu email server. I have followed ubuntu own guide for SMTH AUT (https://help.ubuntu.com/14.04/serverguide/postfix.html). But my email client ...
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1answer
71 views

Windows 2008 RC2 IIS6 SMTP Virtual Servers - Limited to 4

In line with this post: http://www.hugheserblog.com/2012/05/22/error-creating-iis-smtp-virtual-servers/ I am receiving the same issues: When we tried to add more than 4 IIS SMTP virtual servers, ...
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0answers
51 views

How Do I Configure Nginx To Communicate with SMTP Server?

I'm an application developer and have little knowledge on sysadmin / server configuration tasks. I have an nginx server communicating to a Flask web application through uWSGI on a VPS. I'm trying to ...