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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.

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1answer
778 views

Client host rejected: cannot find your hostname + SMTP

I have a VPS configured with dovecot. Now for some of the mails that I send are rejected with the following error: Any Clues?
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1answer
17k views

How to configure synology NAS for SMTP server [closed]

first of all I have to admit that I'm a beginner in this topic. In fact this is my first post. I have a synology 213J that I want to configure as SMTP server. I discovered that I needed a domain in ...
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1answer
133 views

How is postfix relay configured by default on OSX?

On OSX, I don't need to configure postfix at all, I just sudo postfix start and it all works. In the log files, I see Apr 23 14:04:46 orcrist.local postfix/smtp[19506]: 9211B2E4B96C: to=<me@...
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1answer
407 views

SBS 2003; Exchange 2003 can't receive mails without SMTP connection but without POP3 connector [closed]

i hope you can help. I'm losing my mind. I'm not a specialist in SBS but i have a huge problem. I wanted to replace the mircosoft pop3-connector with popcon because i was told that several mails ...
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1answer
3k views

SMTP to MAPI to see email in sent items? [closed]

I have a property management system that sends email via SMTP. In my case, the SMTP server is my Exchnage server. The system is poor and known for crashing when sending multiple emails. It also ...
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1answer
820 views

Why am I unable to send mail? [closed]

I installed iredmail, and used it to set up a mail server on Debian 7 based VPS. Everything went fine, I can send and receive email via webmail. However on trying to send mail via SMTP on a client ...
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1answer
694 views

SMTP - Remove IPv6?

We're doing a "try-out" of SmarterTools SmarterTrack (help desk) software. We can't get it to send email. We showed someone at SmarterTools our log - SmarterTrack keeps its own SMTP log - and they ...
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1answer
432 views

Exchange SMTP address limit

i have an Exchange SMTP server but I want to enable this SMTP just for my email addresses (i don't want an open rely mail). How can I block all other recipients? Thanks.
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2answers
3k views

Same domain only : smtp; 5.1.0 - Unknown address error 530-'SMTP authentication is required [closed]

I have a very strange problem after moving my netwave.be domain from WebHost4Life to Arvixe. I configured several email adresses, like steven@netwave.be and sandra@netwave.be. For POP3 I can use ...
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1answer
94 views

PostFix | SMTP Server [closed]

What is a Post Fix, Can some one explain in a very Simple Language. I have a dedicated server, what is needed to Install on it so that I can Convert it into SMTP, with authentication.
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1answer
488 views

How to setup SMTP receiver, without postfix, sendmail or other complex software

I have successfully configured ssmtp to send emails from our local server (using a single external mail account) for sending reports, build results and so on. The other task is to let our software we ...
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1answer
419 views

Postfix: Specialty configuration; incoming to pipe, outgoing treated normal

First, a description of what I'm trying to do here: Incoming mail should be directed to a script (PHP, specifically, but it shouldn't matter) Afterwards, the mail should be discarded (not sent ...
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2answers
1k views

Postfix has high load with smtp connections

I have a client who has been allocated 20 ip's specifically for mailing newsletters, alerts, etc. Typically, the amount of mail sent per day to users is around 1 million although it can peak at around ...
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1answer
228 views

Proper way to setup SMTP server and Reverse DNS Records

I have IIS 6 SMTP server running on 2003 box. I am running a webserver (IIS) on the same system. I want the SMTP server to deliver mail for my webserver. I have it working fairly well - my only ...
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1answer
860 views

550 Relay Denied in Xmail

I am running Xmail server in Windows 2003. When I took SMTP test at MxToolBox.com I am getting an error as 550 Relay Denied. How to fix this error? SMTPrelay.tab file contains the following. "65.75....
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1answer
70 views

Automatic mail directories implied by address, preferably on a CentOS Cpanel setup [closed]

To put it simple, i have a default email me@abiusx.com, i want every other email like x@abiusx.com to be forwarded to that default email, but in a way that i know its been sent to x@abiusx.com (put in ...
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3answers
6k views

550 Requested action not taken: mailbox unavailable

I setup a small box with Server 2003 64bit to be used as a webserver and email server for a small school. Real simple stuff for a few users. A simple website and a handful of emails. rDNS and spf ...
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2answers
3k views

Exchange2010 has Private Machine Name and IP in outbound SMTP - How to remove?

We have a domain (domain.local) that has IP Addresses in the 10.10.10.* range. In the outbound SMTP server traffic, I see the internal machine name (exchange.domain.local), and the internal ip ...
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1answer
2k views

pam-mysql is not connecting to the database

I have set up postfix using mysql but am running into a problem when trying to send mail out -- the SMTP server fails on authentication: /var/log/mail.log: localhost postfix/smtpd[16637]: connect ...
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1answer
38 views

Postfix relay outgoing emails based on recipient

I'm having trouble with Microsoft rejecting all our emails, I've contacted the Outlook.com Deliverability Support 3 times and 3 times they've told me that there's no problem with our IP and that I ...
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1answer
419 views

Why smtp server can not be telnet?

https://www.webdigi.co.uk/blog/2009/how-to-check-if-an-email-address-exists-without-sending-an-email/ I am following the above instruction to telnet an email server of gmail. But I got an error. ...
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2answers
429 views

SMTP external connection telnet not working

I recently installed postfix , openssl , configured SMTP and all records on cloudflare but for some reason I cant find out It does not work When I try to connect using telnet [root@reputation ~]# ...
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1answer
332 views

Exchange Server 2016 Standard: Connect mailbox to external mailbox [closed]

I'm searching for a method to connect exchange mailboxes with external mailboxes. I checked the EAC (found Send and Receive Connectors but they don't seem to be the right answer) and on web (found 3rd ...
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1answer
866 views

smtp error “550 Delivery not allowed to”

Our Moodle (course management website) has been configured with an email account that can send emails to the students. The created email address is working fine. I mean I can login to the mail server ...
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2answers
193 views

SMTP recipient callout using static sender address

Our mail provider provides the MXs for our domains, performs some screening on the mails (spam checks etc.) and then delivers the mails to our internal mail server. (They use Cisco Ironport.) They ...
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2answers
277 views

Binding domain and SMTP server on a foreign server

I have a trouble with my server setup, I'm trying to bind both IP domain + his SMTP server on the same external server. However mxtoolbox still give me the same error : "Reverse DNS is not a valid ...
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1answer
672 views

Is it possible to send emails to a gmail address WITHOUT using GMail as a relay server?

I've been fighting all day trying to properly configure Postfix to get the emails delivered to GMail addresses I finally got it by using GMail's SMTP as a relay server, sadly that server overrides ...
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2answers
401 views

Port decisions for email setup in 2016 (Ubuntu)

I have a new Ubuntu 14.04 LAMP server with the UFW firewall setup on DigitalOcean. My goal is to add email for use on my phone(iPhone) and laptop(via Roundcube). There is a lot of old information ...
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1answer
2k views

mutt failed to send mail with error "sendmail: Cannot open mail:25

Hi I am trying to send mail using mutt command as below, mutt -s "test" madk@mycompany.com </dev/null This fails with following error, sendmail: Cannot open mail:25 Error sending message, child ...
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1answer
1k views

Exchange 2013 Receive Connector Scoping and Open Relay

I have an Exchange 2013 server which was a victim of spam infiltration, and the exchange server was being used as an open relay for unauthorized users (and domains) to remotely send spam. I have done ...
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1answer
498 views

Exim4 server setup and configuration with remote SMTP

I am trying to setup exim4 server with remote SMTP server. Here is my configuration for Exim4. dc_eximconfig_configtype='smarthost' dc_other_hostnames='test.com' dc_local_interfaces='127.0.0.1;' ...
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1answer
232 views

My server mail going junk in hotmail and yahoo [duplicate]

All my server mails going to spam in hotmail and yahoo. Here is my full mail source. Can any one please help me to sort out this issue ? x-store-info:4r51+eLowCe79NzwdU2kRyU+pBy2R9QCDI9u8Kc1Jen/...
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1answer
204 views

postfix apparently relay email

I have read as many documents as I could understand about tuning postfix main.cf parameters, but still get some external email relayed. Here is a typical example in /var/log/mail.log: Mar 6 06:26:13 ...
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1answer
105 views

Sending emails from non-configured domains with postfix/dovecot

I am trying to setup a mail server with postfix/dovecot. I can currently receive emails and send emails from domains that I have configured. I have a lot of domains and my email setup is simple - ...
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1answer
393 views

hotmail.com - Unrouteable address

I'm using Exim on my mail server, and trying send email to someuser@hotmail.com address. I got email from this address, and make "replay" then. But - I have return from my SMTP with Mail delivery ...
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2answers
6k views

“Connection to host lost” on telnet to port 25 [closed]

i installed smtp4dev to test receive mails in my localserver(xampp) for the registration form here: https://github.com/panique/php-login note: localserver is on port: 8080 my php.ini file for SMTP ...
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1answer
799 views

Postfix cannot send to external domains

I set up my Postfix with a sasl link to a Dovecot user / domain database. Postfix is giving the following error message when trying to send mail to external recipients (internal are fine): Server ...
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1answer
693 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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1answer
194 views

Allow spoofing on postfix server

I'm trying to set up help desk software which requires the ability to change the headers of a message (aka 'spoof' it). Right now, my mail server is configured to use SASL and requires authentication ...
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1answer
3k views

Cannot connect to remote port 465

I (actually, not me, rather a friend of mine) have a very strange issue. There's a VPS with CentOS, probably version 5: Linux [hostname] 2.6.18-274.7.1.el5xen #1 SMP Thu Oct 20 17:43:28 EDT 2011 i686 ...
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2answers
629 views

Detect malicious script or reason creating lots of smtp connection [duplicate]

My VPS was suspended due to lots of SMTP connection(over 2000) per hour. But I am pretty sure none of my script was sending mail. I am using google apps and live service for mail. I have blocked my ...
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1answer
2k views

Postfix smtp mail to external hosts not possible

I administer a server (Ubuntu 12.04 LTS) running a web server and a mail server - The web server is running all fine, but the mail server is a problem. I have Dovecot installed and configured ...
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1answer
173 views

How to save addresses from bounced messages in Exim 4?

I need to save all bounces in a database, so I can query it from my application and not mail to any address that bounced more than X times. If I recall correctly, Postfix allows to pipe messages to ...
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1answer
489 views

Something keeps connecting to Dovecot and Postfix

My Dovecot mail server and Postfix MTA seems to be generating logs about attempts to login from localhost. How could I investigate this issue? Log excerpt: Jun 8 09:36:31 mailserver postfix/smtpd[...
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2answers
1k views

Sendmail configuration on Linux

I'm running a perl script which wil create weekly report in CSV format. I want this report be emailed to the manager. hence I am trying to configure Sendmail on my RHEL 5.6 server so that I can ...
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1answer
130 views

Want to store To,From,Bounce,and mailstatus in sql database? [closed]

On my postfix relay server i want that postfix do not create /var/log/maillog file and directly store To, From,Bounce Address and mail status directely in sql server database. How can i do this ?
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1answer
704 views

Postfix “Relay access deined” error with Outlook

I am following this tutorial and finished the basic setup. I can login and send via squirrel mail and telnet but receive a "relay access denied" error in the logs when i try and send from Outlook. all ...
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1answer
250 views

Is there are postfix setting to disable prepending a sender path in the Received: header?

Currenty emails are sent/received as : Received: from localhost.localdomain (sender.host [xx.xx.xx.xx]) by smtp.host (Postfix) with ESMTP id 7F6CC67897 for <mail@example.com>; Thu, 19 ...
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2answers
167 views

How do I setup an SMTP service to accept MX bound mail and deliver all of it to two separate SMTP servers

I want all mail to go to two SMTP servers and each server does everything it would do if there was only one SMTP in the first place. In other words people get mail in two places and they are out of ...
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2answers
4k views

hMailServer doesn't let me send mail through Thunderbird - works with non-default port

I have hMailServer installed on Windows Server 2008. It's all set up and working, except that I can't send mail from it through Thunderbird (getting an SMTP timeout message) from my own PC (which is ...