Podcast #128: We chat with Kent C Dodds about why he loves React and discuss what life was like in the dark days before Git. Listen now.

Questions tagged [smtp]

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.

Filter by
Sorted by
Tagged with
0
votes
2answers
2k views

Powershell to export Windows 2008 R2 SMTP Relay Restrictions IPs

I've been searching all over the interwebs and have had no luck so far. Does anyone know if it is possible to use Powershell to export the list of IP address within the SMTP Relay Restrictions section?...
2
votes
2answers
32k views

exim configuration: 503 AUTH command used when not advertised

I'm running a piece of software on a Windows server that sends email notifications via a remote SMTP server. It has very few configuration options, and only supports basic SMTP authentication without ...
1
vote
1answer
956 views

Do I have to, and how do I setup bounce emails HELO command?

Our server has been listed several times on CBL (see this question) because it "attempted to send email without using the HELO/EHLO command". Grep'ing on HELO on Exim's logs, I found such suspicious (...
0
votes
1answer
1k views

Relay Server settings for Exim to connect through SMTP/Mailgun

What I'm trying to do: Send out Wordpress notifications using SMTP/Mailgun instead of PHPmailer. I have a production VPS with one IP and several Wordpress installs with different domains. It has WHM ...
0
votes
2answers
1k views

Can't send email on Windows Server 2008 with Mailenable

I've got a VPS running on Windows Server 2008 and I'm using Mailenable as an Email Server for POP3 and SMTP. I've had the VPS since January 2015, its my first time configuring a server by myself, but ...
0
votes
1answer
71 views

SMTP error '554 5.7.1 Relay access denied' with using postfix

I have been trying to setup a mail server on my ubuntu vServer for the last couple of days. I use postfix with mySQL and Courier. For webmail, I use roundcube. I can receive emails to my address, but ...
1
vote
1answer
1k views

postfix: smtpd_sender_login_maps regex matches everything instead of only SASL

I want to prevent spoofing so I found this postfix option: smtpd_sender_login_maps (default: empty) Optional lookup table with the SASL login names that own the sender (MAIL FROM) addresses. ...
0
votes
0answers
15 views

Office365 SMTP Relay - Configure access to send as everyone

I need to be able to grant an Office365 Global admin the permission to send as everyone within the domain. How can I do that?
0
votes
1answer
1k views

Postfix do not listen on SMTP Ports

i have a problem with my Postfix on Ubuntu 18.04. Problem seems to be Postfix do not listen on SMTP Ports 25, 465 or 587. UFW firewall is disabled. Telnet result to the machine on Ports 25,465 and ...
2
votes
3answers
426 views

How does yum-cron send emails from localhost?

I have an amazon linux 2 server running in the aws cloud and I have yum-cron running on it. I have an email domain mydomain.com which is running on a separate server in a completely different cloud ...
0
votes
0answers
19 views

Cannot send e-mail after configuration of postfix

After I had follow this tutorial and configured postfix o my server, when I try send a e-mail with: echo "test email" | sendmail <my e-mail> I got this message on the '/var/log/mail.og' file: ...
1
vote
1answer
995 views

Server responded: 503 AUTH command used when not advertised\r\n?

I recently migrated from one server where my mail settings worked without a problem to a new server which now results in the following error: Server responded: 503 AUTH command used when not ...
2
votes
1answer
2k views

Exim not Listening on port 465 or 587 for TLS connection

I am configuring Exim on a Ubuntu server to send and receive mails via TLS. Followed many guides which shows on how to configure Exim with TLS but still my Exim doesn't listen on 465 or 587 Exim ...
0
votes
1answer
1k views

SMTP implementation on EC2 using Pear Mail package (PHP)

I am working on sending out SMTP relay email's using Gmail as my server using Pear Mail package in PHP. I have installed Pear package using YUM. Also I have located the path for pear_dir and included ...
4
votes
1answer
948 views

edge server 2016 not receiving email, blocked ports?

I am trying to setup a new Exchange 2016 implementation. I can send emails but I cannot receive them. So far, the emails don't get rejected though I suspect in a few days, they will start to bounce ...
0
votes
1answer
1k views

SMTP network ACL on AWS

I have a very restricted ACL for my VPC. We have a public subnet and a private subnet, each subnet has its own individual ACL. What I don't understand is why the following ACL works for sending email ...
0
votes
3answers
880 views

Allow only Postfix to send mails through port 25 - iptables rule confusion

I know there is already a thread, mentioning how to allow only postfix to send mails through via port 25. Firewall rule to only allow Postfix to send email through SMTP on port 25 My problem is, that ...
1
vote
0answers
46 views

Windows Server 2019 SMTP Server - Email Stuck in Queue / Not Being Released

I've recently upgraded a number of servers from Windows 2008 R2 to Windows Server 2019. 2 of the servers require SMTP which I have installed on both, however, 1 server works as it should and the 2nd, ...
0
votes
1answer
30 views

msmtp and OVH mail

I'd like to send a mail when a user authenticates on a Debian 9 server. I use OVH mail server. I've set up msmtp like so : account myaccount tls_starttls off logfile ~/.msmtp.log host ssl0.ovh.net ...
0
votes
1answer
2k views

Have Exchange/Outlook process html tags in SMTP mail

I am working with a third party application that sends simple SMTP email messages. The application doesn't respect line breaks or multiple spaces so the resulting email is barely legible. Since the ...
0
votes
3answers
18k views

Postfix & Gmail: Authentication Required error

I configured Postfix using this guide. When I send a test E-Mail I get the following error message: May 23 15:36:26 VM11 postfix/smtp[15321]: connect to smtp.gmail.com[2a00:1450:4001:c02::6d]:587: ...
0
votes
1answer
959 views

What is the maximum message size that SendMail can successfully receive and where would the bottlenecks be?

CentOS 5.x | SendMail 8.14 I'm curious - what is the largest message size that SendMail will successfully accept from an upstream source via SMTP? The tweaking config options page indicates that by ...
0
votes
0answers
13 views

postfwd: exclude email address from rules

How can I exclude specific email addresses from a postfwd rule? As an example I use this rule which limits the allowed messages per hour. id=R01; sender=~/.*/; action=rate(sender/100/3600/REJECT too ...
0
votes
2answers
1k views

Routing outbound SMTP with IPTables

I am trying to transparently filter outbound SPAM from one of my hosting boxes. I have set up an external mail server that filters SPAM and now I am looking for a way to route all outbound SMTP ...
0
votes
0answers
25 views

How to configure SMTP Relay & SSL Encryption for hMailServer?

I'm currently trying to set up a mailserver and have had some issues. Issue 1: I can't get emails to send to domains other than my own. However, I can receive emails from other domains just fine. ...
1
vote
2answers
4k 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 routines:SSL3_READ_BYTES:...
2
votes
3answers
110 views

Message-ID of delivery report is equal to original mail

I discoverd that the delivery status report has the same message-id as the original mail. Here is the text of the delivery report: Incoming DSN message: From: Mail Delivery Subsystem <postmaster@...
1
vote
2answers
5k views

AD User Authentication to Exchange 2016

We have a number of devices that send email through our Exchange 2010 server. These devices all authenticate using a domain user prior to sending the message and this was working fine on 2010. We ...
2
votes
2answers
2k views

Exim: Force email auth for users of local domains

I'm configuring exim4 for virtual users with dovecot and postgresql and I got a problem I cannot resolve, the situation is this: I need that when a 'localdomain' user tries to send a email to another ...
18
votes
4answers
42k views

Legitimate reasons SMTP “MAIL FROM:” will not match “From:” Header in DATA

Is there ever a legitimate reason for the SMTP “MAIL FROM:” field to not match the “From:” field in the DATA section of a message, besides mailing lists? From https://stackoverflow.com/questions/...
0
votes
1answer
51 views

Sending AD User details through SMTP

I used the following PowerShell script to make new AD users, and after the user is created, a user id and password are displayed in Powershell. Now, I will like to have this userID and password to be ...
0
votes
1answer
369 views

Mail tester have 10 score, but email flagged as spam, by gmail

I have setup an smtp postfix server, with opendkim, on a domain code-gmail.com I have put spf policy, dkim, dmarc in my domain TXT recors. I did setup reverse dns, to point correctly do my domain, i ...
6
votes
3answers
839 views

What problems arise when we use a self-signed certificate for the SMTP protocol?

What problems arise when we use a self-signed certificate for the SMTP protocol, that is, when a SMTP server uses a self-signed certificate? As long as the user accepts the exception warning due to ...
0
votes
1answer
1k views

SMTP Server Needs Daily Restart - Windows Server 2008

I've got a Windows Server 2008 machine that is using an SMTP server with IIS 6. (I don't know the circumstances of that setup.) The machine itself uses IIS 7. It quits working after like a day. I ...
0
votes
1answer
1k views

Uanble to connect to SMTP server (IIS) externally

I've set up a SMTP server using IIS 6 on Windows Server 2008. I've set it up for "All Unassigned" IP adresses on port 25. I've also added 127.0.0.1 and the IP to the extrenal source in the "Relay". I'...
1
vote
1answer
2k views

Postfix 2.6.6 with TLS - unable to receive emails from GMail (and a couple of other MTAs) but others are OK, why?

I've just had to look at a CentOS 6 server running Postfix 2.6.6 which was able to send emails to everyone, but could not receive them from GMail (and a few other MTAs) due to incoming TLS negotiation ...
15
votes
3answers
9k views

What is the best method for sending email on behalf of my clients' domains?

I wanted to know the best way to make my mailserver send emails on behalf of my clients' domains, without being greylisted and also avoiding bounce problems. I've been reading some other questions ...
2
votes
1answer
78 views

Will running a secondary SMTP server for localhost delivery cause delivery problems?

I have a scenario where I'm using a primary SMTP server from cPanel, however I'm running a Dockerized web app on a second server that is having trouble delivering to the main smtp server due to a bug ...
2
votes
1answer
12k views

How to make Request Tracker use an external SMTP mail server?

I am using Ubuntu 10.04 and by following this tutorial I have made RT run well in everything except for sending outbound emails. The difference is, I need to make RT use an external, existing mail ...
1
vote
0answers
16 views

Windows Server 2012 Blocked Network Activity

I am trying to telnet some other machines from my Windows Server 2012 computer, and also to test the SMTP connection using telnet again. Although I have created all the required Windows Firewall ...
0
votes
2answers
2k views

Postfix disable “outbound” email

I am trying to wrap my head around the following. Is it possible to have a postfix-"recieve-only"-server. eg mx.example.com should only receive mail too a specific list of domains. It should not be ...
0
votes
1answer
1k views

Sendmail's MTA, MDA and SMTP 550 User Unknown forwarded to postmaster

I have two boxes running sendmail and configured as: MTA accepting connections from the outside world (mta.xyz.com) MDA accepting connections from internal network and storing them in user mailboxes (...
0
votes
1answer
1k views

Show blocked SMTP connections in Exchange 2010

Currently, I have an anonymous receive connector set up on my Exchange 2010 system that allows from an entire subnet. I'm looking to change this to only allow from specific IPs, but need to know when ...
0
votes
1answer
2k views

Interspire Email Marketer taking long time to send bulk emails

I am using Mailjet SMTP Server along with Interspire Email Marketer to send emails to a large group of users (around 54,000). I once used Mailjet's inbuilt Email Marketer to perform a similar function,...
1
vote
2answers
393 views

Multiple mail servers and reverse DNS

If I have three mail servers MS1, MS2 and MS3 all with different IPs but share the same domain name (exampledomain.com) and I use an SPF record to specify them, how would reverse DNS work on the ...
0
votes
1answer
29 views

Exim - slow to deliver mails

I have just setup my own Exim SMTP server to send emails But I experience something strange when I sent out newsletters.. Alot of times when I send through Exim, mails are delivered with a delay up ...
11
votes
2answers
19k views

Why is Postfix trying to connect to other machines SMTP port 25?

I get these errors: Jul 5 11:09:25 relay postfix/smtp[3084]: connect to ab.xyz.com[10.41.0.101]:25: Connection refused Jul 5 11:09:25 relay postfix/smtp[3087]: connect to ab.xyz.com[10.41.0.247]:25:...
2
votes
2answers
2k views

Postfix doesn't require authentication for local emails?

I've got a Postfix/Courier mail server (Authenticated with SASL/MySQL) all according to this tutorial. I'm currently running my server on Debian 6, it is a VPS. It works well as far as I can see but I ...
4
votes
3answers
813 views

SNI like equivalent for starttls

I am trying to host two seperate domains on one IP address. I want to be able to determine from the STARTTLS command which certificate was being requested and forward to a different mail server based ...
0
votes
1answer
1k views

503 AUTH command used when not advertised exim4 - Outlook

I do keep on getting this error: 503 AUTH command used when not advertised I have seen this question : exim configuration: 503 AUTH command used when not advertised The difference is that i do not ...