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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Forward all SMTP traffic to anti-spam server except for authenticated SMTP?

Historically, we have handled SMTP traffic across a handful of multipurpose servers each with their own local spam-fighting stack. We've grown and this is no longer feasible to maintain. Now we have a ...
0
votes
1answer
51 views

Outbound SMTP email not being delivered, but still disappearing from the queue and pickup folder

After setting up my smtp server on a Windows 2012 server r2 on port 587. I tested the email functions by creating a text file labeled email with the following code inside: From:admin@mydomain.com ...
2
votes
3answers
6k views

Cisco ASA rewriting SMTP traffic to prevent mail sending

We have a Cisco ASA 5505 (version 8.0(4)) that is preventing outbound SMTP traffic; testing with telnet shows connections on port 25 are having everything converted to *s while the same does not ...
0
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1answer
31 views

Windows Server 2008 IIS6 SMTP With more than 1 FQDN

I've tried researching this one, but I'm not having much luck on google. What I have is a Windows Server 08 R2 with IIS6 SMTP installed and configured / working 100% perfectly for Domain A. Domain ...
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votes
1answer
16 views

TLS for outgoing mail (following ISPmail) not working

I built my mailserver on a vserver after the ISPmail tutorial (https://workaround.org/ispmail/wheezy) (which is awesome). The only remaining problem is that it does not seem to use TLS with outgoing ...
0
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1answer
451 views

RAID Card Event Notifications Email to Gmail

I need to get email for event notifications from our RocketRaid 2782. The problem is I don't see a way to get it to send mail to our google apps gmail account. I don't think the card offers ...
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votes
1answer
14 views

Hosted email routing service while downgrading domain [closed]

I'm at a situation where I need to close a domain on Google Apps due to inactivity, while closing the domain I would be interested to preserve emails sent to that domain. I understand that my ...
5
votes
2answers
221 views

What is the difference between 3-digit and dotted SMTP error codes?

When looking up SMTP error codes, I sometimes see "550", or "5.5.0". And sometimes the number in the dotted code is different. I found the numeric codes defined in RFC 821 and the dotted codes in RFC ...
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1answer
64 views

New CentOS 7 server - Sending mail from a PHP application

Apologies for the newbie question but i'm hoping someone can provide me with some help/steps. I am in the process of migrating a website from a managed shared hosting account online to a new CentOS 7 ...
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0answers
25 views

Updated hostname of server but old hostname still appearing appearing in Postfix logs?

Been having some trouble with emails bouncing when being sent to certain addresses from our CentOS 6.4 Media Temple DV server. I am no expert but after checking the mail logs it appeared that they ...
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votes
1answer
34 views

How to process sendmail queue when 25 port is blocked? [closed]

I have one VPS which forwards e-mails from one mailbox to another. Unfortunately ISP have blocked 25 port last week and since then I can't receive any e-mail from it. According to mailq there are ...
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0answers
33 views

Mail server still BLACKLISTED after fix the issue

I have an Exchange 2007. CBL has blacklisted me because: This IP address is HELO'ing as "localhost.localdomain". If you test and helos properly means something OTHER than your mail server ...
5
votes
5answers
14k views

Easiest way to send a test email from a server, to test settings?

Using Windows (2008) is there an easy command line tool that I can use to send a test email from a server to test the SMTP, user authentication, ports, etc... without writing my own?
2
votes
1answer
4k views

monit send email does not work

I am trying to use monit, and set up email server using gmail. The configuration file is like this: set mailserver smtp.gmail.com port 587 username "someuser@gmail.com" password "password" using ...
1
vote
1answer
66 views

How to unassign self-signed cert from SMTP on Exchange 2010?

We have a GoDaddy wildcard certificate that we have installed into Exchange 2010 and is successfully used on IIS connections for OWA. We have assigned this certificate to the SMTP Service as well as ...
0
votes
2answers
410 views

change ehlo name of Amavis

Server: Ubuntu 12.04 64 bit Setup Postfix + Dovecot + Amavis with Mysql for Virtual domains. I have configured the postfix mailserver successfully. However when I test the Email with mail-tester.com, ...
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votes
1answer
43 views

SMTP-Mailing with PHP works - but not with PHP-Cli

I mentioned a strange behavior on my webpage: If I try to use Joomla to send Mails via SMTP it works fine; no problem at all. But: If I try to use a PHP-CLI-Script the action fails (same source ...
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0answers
92 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 ...
3
votes
2answers
112 views

Is setting up my own SMTP server to send email a waste of time with regards to deliverability?

I have a dedicated host serving a few domains I manage. I host my own email and IMAP server. The server is at buildoneforme.com with IP address 144.76.81.247. I think reverse DNS is working: $ host ...
2
votes
2answers
31 views

Where do these “single-dot” smtp connection failures come from?

I'm running a mailserver based on postfix. There are a lot of connection failures like this: Transcript of session follows. Out: 220 hostname.tld ESMTP Postfix In: . Out: 502 5.5.2 Error: command ...
0
votes
1answer
16 views

Mailman not integrating with postfix properly

I installed postfix on my local machine and able to send mails to local users i.e. shivams in my case which is username of the account. Also i am able to send mail outside of my machine for ex. ...
0
votes
1answer
66 views

Google Apps with internally/customer hosted SMTP relay - (not using smtp-relay.gmail.com service)

We are using Google Apps for our email service, and send a bulk of around 15k emails a day from our internal relay server (its outbound only, no open-relay) to customers. Recently, we ended up ...
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1answer
34 views

Outbound emails not being signed with DKIM using Postfix on Centos

I have been using phpmailer for my emails and i had dkim working correctly with this. I have a key mail._domainkey.domain.com. I have validated my past emails with http://www.mail-tester.com/ and i ...
2
votes
2answers
2k views

reason: 403 4.7.0 TLS handshake failed

Sending email to one particular domain, I get the following error: ----- The following addresses had permanent fatal errors ----- <> (reason: 403 4.7.0 TLS handshake failed.) ----- ...
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1answer
41 views

Postfix: Set custom SMTP Banner based on address used to access server

The Postfix parameter smtpd_banner sets the text of a server's SMTP greeting banner. The default setting is: smtpd_banner = $myhostname ESMTP $mail_name My mail server has several unique IP ...
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1answer
50 views

What directory permissions does Postfix require to copy mail into a users maildir folder?

I have postfix setup and running. Everything seems good other than the directory permission errors. In the past i accidentally ran chown -R apache / which as you can imagine broke a crazy amount of ...
0
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1answer
41 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 ...
2
votes
2answers
3k views

host said: 550 IP is not allowed to send mail from gmx.de (in reply to RCPT TO command)

This message was received by a mailing list maintainer, that one of our customers subscribed to: host mailx.paritaet-bremen.de said: 550 213.30.233.146 is not allowed to send mail from gmx.de (in ...
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0answers
71 views

530 5.7.0 must starttls command first

I have installed postfix and davecot into my server. And I tried to test it to send email. But I got the error message: 530 5.7.0 Must issue a STARTTLS command first after telnet localhost smtp, ...
4
votes
1answer
117 views

Postfix reject_unknown_reverse_client_hostname: replace default unknown_client_reject_code (450) to 550. Why/When I should not?

In the daily battle against SPAM, there have been several times when I've been tempted to heavily enforce DNS requirements from clients connecting from the wild Internet. In detail, I would have ...
0
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0answers
288 views

hMailServer SMTP installed in LAN, clients in LAN can send Email but clients from the Internet cannot

I had checked the troubleshooting guide and many posts here and could not find solution so far. I had setup a network in Azure Cloud with 2 VMs, 1 of which is domain controller and the other is Web ...
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votes
1answer
84 views

What's the difference between postfix/smtp and postfix/smtpd

A bit confused when reading through the logs of my smtp/mail server, I'm turning this questions to you guys. In the maillog files I'm seeing entries for postfix/smtp as well as postfix/smtpd. I can ...
0
votes
1answer
37 views

possible for all outbound smtp to run through proxy?

Is it possible to setup my centos 6.5 so all outgoing port 25 is run through a proxy. I have incoming smtp/port 25 coming to my mail server through HAproxy but i would like the outgoing to do the same ...
3
votes
2answers
1k views

Timeout error in all my apps for every call to smtp servers

On my VPS (a tophost.it "TopServer" with Ubuntu 12.04 LTS), since a few days ago all my apps are became unable to send emails. All I could learn from the logs is that every request goes timeout. I ...
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votes
1answer
34 views

Forwarding emails to external domains - aliases vs mda sieve script?

There are 2 points in the flow of a incoming email where emails can be forwarded: As soon as aliases are expanded (setting the target email as alias target) As soon as mails are handed over to the ...
2
votes
2answers
3k views

Postfix stop outgoing delivery but accept all incoming

I'm doing development for a webapp that sends emails out to users. I've typically used Argosoft Mail Server (Freeware) in a windows environment as an SMTP server in which I've enabled relay but ...
0
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0answers
32 views

IIS 6 SMTP service stops working after server restart

I'm currently wrestling with IIS6 SMTP service not working properly when the server is restarted. This has only just started happening in the last month and struggling to pin point the issue. I ...
0
votes
2answers
3k views

Troubleshooting 5.5.0 smtp; 503 Bad sequence of commands (Microsoft SMTP + Exchange 2003)

Note: this question has changed. Originally I believed it had something to do with BDAT. An external party is trying to send us a message to a valid address and they're getting an NDR: ...
1
vote
1answer
26 views

SMTP server for testing purposes with a few specific requirements [closed]

As our company started doing development work on their on-line product they used a gmail address for testing purposes, using '+' notation to deliver all test e-mails to a single mailbox. Over time ...
1
vote
1answer
146 views

Postfix mandatory smtp/smtpd vs “not mandatory” difference and configuration

Three questions: Correct me if I'm wrong: smtpd_tls_mandatory_ciphers => settings for incoming mandatory TLS encryption smtpd_tls_ciphers => settings for incoming opportunistic TLS encryption ...
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0answers
89 views

CentOS Postfix/Dovecot status deferred conversation with 127.0.0.1[127.0.0.1] timed out while receiving the initial server greeting

Linux Kernel: Linux 2.6.32-504.16.2.el6.i686 on i686 RAM: 6GB OS: CentOS 6.6 Postfix 2.6.6 Dovecot 2.0.9 Relay Host Verizon Stunnel through 127.0.0.1:2525 Webmin 1.750 Virtualmin 4.17.gpl Multiple ...
0
votes
2answers
61 views

Postfix spam abuse [duplicate]

I have a terrible problem, my joomla website is being abused to massively send spam. I have no clue on what is actually happening, but my postfix mail queue is constantly filled with thousands of spam ...
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votes
2answers
68 views

How to install a Mail Server on your Windows Server [closed]

I am looking to move my hosted site + email onto my Azure VPS (Windows Server 2012). I can migrate the site successfully using the @ A Name Record, but how would I go about the email? Do I need to ...
0
votes
1answer
25 views

Exchange 2007 - SMTP Traffic

I've done a check of what SMTP trafic is being routed through a 2007 mail server, which we are decommisioning. It looks like all printers are using the mail server for smtp relay, would it be ...
0
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2answers
42 views

Mail delivered via server IP not associated with sender

When a sunbirdinc.com account sends an email to an earthlink.net address, the following message bounces back: ToSomeone@earthlink.net host mx1.earthlink.net [209.86.93.226] SMTP error from ...
0
votes
1answer
46 views

Postfix + php translating email addresses sent to local domains to something@localhost.localdomain [closed]

My first question here, if I don't provide sufficient info straight away, please take it easy on me with the downvotes ;-) I'm running a VPS hosted by afterburst.com with OpenVZ I installed and ...
0
votes
2answers
109 views

SMTP Reverse DNS Mismatch Reverse DNS does not match SMTP Banner

I wonder if you could help me? I have set rDNS to mail.simplyislam.biz for IP 178.32.48.104 with my hosting server and also in DNS control panel. However, I am still failing this test: ...
0
votes
2answers
1k views

Relay access denied (in reply to RCPT TO command) Postfix Issue

I am trying to configure my server for email taking reference form this link: SMTP Relaying Outgoing Mail in Postfix - using Webmin. I used Mandrill smtp server in my case. I have also configured a ...
0
votes
4answers
6k views

Postfix: warning: connect to 127.0.0.1:10023: Connection refused, not receiving mail from outside domains

I've had a Postfix server running for a very short amount of time, and it worked, but I had to restart the server today, and I'm no longer receiving e-mails from external sources: Jan 23 01:34:44 ...
0
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1answer
47 views

IronPort, DLP and SMTP integration

We have configured IronPort, DLP and SMTP in my organization. Now I am getting an error message: statin - : TLS handshake could not be completed". Questions: Can anyone please tell me whether ...