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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14 views

IIS SMTP Service LDAP

Right now, I am trying to validate the users of my smtp with Active Directory to avoid directory harvest attacks. I have tested a lots of way but none of them seems to be working. See the below ...
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1answer
27 views

Postfix still complains that “certificate verification failed” even when “smtp_tls_security_level = fingerprint”

I'm attempting to use Postfix (version 2.6.6 on RHEL6) to connect to and send mail via a mail relay on our internal network. I want to connect with STARTTLS on port 25 (port 465 is not available on ...
1
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1answer
19 views

Swiftmail cannot use sendmail/postfix

When I try to run some Kohana swiftmailer I get the following error in maillog: Jul 23 17:18:37 ads postfix/sendmail[5818]: fatal: execv /usr/libexec/postfix/smtpd: Permission denied The output of ...
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0answers
38 views

determine which application is sending mail via postfix

I would like to track down which applications (other than PHP, which I can track via mail.log setting in php.ini) are connecting to and sending email via postfix. Is this possible via any log ...
0
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1answer
18 views

exim4 - Why is rate limiting outbound mail to a smarthost only working with acl_not_smtp?

In an effort to rate limit outgoing emails per recipient (all emails are sent by the same user), I've been doing some testing in a very simple environment: ...
0
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0answers
22 views

syslog-ng 3.5 flush_lines not working with smtp

What I want: automatic emails every time someone successfully logs into my Ubuntu 14.04 LTS server. /var/log/auth.log gets 2 lines written to it every time I login. Example: Jul 22 13:55:49 server ...
0
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1answer
18 views

monitoring availability of publicly accessible distribution lists

I have an unusual request from management: to set up monitoring of public-facing email addresses that resolve to distribution lists(groups). We are using Exchange 2010 to host these lists/groups. I ...
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1answer
28 views

How to setup intermediate SMTP mail server / relay to filter outgoing emails

I want to block all outgoing emails except to few whitelisted domains. what are the best ways to go about it? Can I put an intermediate Intranet server which will do filtering based on whitelist and ...
0
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0answers
22 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 ...
0
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1answer
16 views

Mail delivery to not-yet-migrated accounts in O365 staged migration

I'm about 10% through a staged migration from Exchange 2003 on-prem to Office 365's Exchange Online. The question I have is how do the migrated users that are now successfully using Exchange Online ...
0
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0answers
32 views

hotmail isn't receiving mail from my server

Hotmail is block all mails (not send to Junk, it really block!) send from my VPS server (even if I send directly from roundcube, for instance). I checked all configs and seems that all is ok. Works to ...
0
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0answers
41 views

Postfix: Relay Access Denied, Reverse DNS Mismatch Error

I have dovecot and postfix installed to handle emails. I have used telnet to check imap and it appears to work fine but when i run telnet mail.domain.com smtp i get 554 5.7.1 <user@gmail.com>: ...
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1answer
20 views

Postfix relaying to local instead of relayhost

I am trying a simple postfix relay of emails via an SMTP server. But I see from the logs that the mails are relayed to local and not to the relay host. The main.cf configurations are below, ...
1
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1answer
30 views

Postfix Outgoing Mail Suddenly Being Deferred

I am having trouble sending mail with postfix after changing the "Format for usernames that include domain" under the "Mail For Domain" template. Basically I had everything working but then changed ...
1
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1answer
10 views

Does IIS 6 Virtual SMTP Server support UTF/Unicode Subject Lines

I have a Windows 2008 R2 server running IIS 7.5 hosting a bunch of websites. These websites relay email through the IIS 6 Manager's Virtual SMTP Server. I'm trying to verify whether or not this ...
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0answers
32 views

With sendmail, how can I allow port 25 to be used only for MTA-to-MTA (aka: prevent outbound relaying)?

In my current sendmail setup, I have two ports configured. PORT 25 (for MTA) PORT 1580 (given to local users for their usage) In sendmail, is it possible to configure port 25 to refuse outbound ...
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1answer
77 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
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2answers
47 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 ...
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0answers
32 views

Configuring multiple IP addresses for SMTP server

Many articles suggested to have more than one IP address for SMTP server in order to avoid spamming and other delivery issues when sending emails to major email providers. I have two thoughts to ...
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0answers
7 views

IIS E-mails from Wordpress [duplicate]

I have just installed PHP MySQL and WordPress (as a site in IIS) on our server. I now want to know how to get e-mails, i.e. from contact forms etc to work? We have an exchange server so I just ...
1
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2answers
30 views

Postfix Domain Whitelisting in Combination with Sender Authentication

I'd like to whitelist several domains in my Postfix configuration in such a way that all e-mails from those domains are accepted as long as they're properly authenticated using SPF and/or DKIM, should ...
0
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1answer
37 views

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
53 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 ...
0
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1answer
39 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: ...
0
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2answers
25 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 ...
4
votes
3answers
68 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 ...
0
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2answers
40 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 ...
0
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0answers
30 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
28 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: ...
0
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1answer
28 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 ...
0
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4answers
182 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
26 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 ...
0
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2answers
71 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 ...
0
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0answers
49 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
27 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
53 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
29 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
29 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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votes
0answers
52 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
34 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: ...
4
votes
3answers
98 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
vote
0answers
24 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 ...
0
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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
87 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 ...
0
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1answer
107 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
28 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 ...
0
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0answers
21 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
44 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 ...